// Numbas version: finer_feedback_settings
{"name": "Semester test 2 - Part B", "metadata": {"description": "", "licence": "All rights reserved"}, "duration": 4500, "percentPass": 0, "showQuestionGroupNames": true, "showstudentname": true, "question_groups": [{"name": "Question 1", "pickingStrategy": "all-ordered", "pickQuestions": 1, "questions": [{"name": "Apply regression model to forecast trip productions", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Christo Venter", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4933/"}], "tags": [], "metadata": {"description": "", "licence": "All rights reserved"}, "statement": "<p>The following trip production model is available:</p>\n<p>&nbsp;</p>\n<p>t<sub>i</sub> = 1.06 + 0.52*X<sub>1i</sub> + 0.21*X<sub>2i</sub> &ndash; 0.46*X<sub>3i</sub></p>\n<p>&nbsp;</p>\n<p>where</p>\n<p>&nbsp;</p>\n<p>t<sub>i</sub> = trips produced (all purposes) per household per day, for household i</p>\n<p>X<sub>1i</sub> = household size</p>\n<p>X<sub>2i</sub> = number of cars per household</p>\n<p>X<sub>3i</sub> = number of unemployed adults in household</p>", "advice": "", "rulesets": {}, "variables": {"A": {"name": "A", "group": "Inputs", "definition": "random(2,3,4)", "description": "<p>no of adults</p>", "templateType": "anything"}, "B": {"name": "B", "group": "Inputs", "definition": "A-random(1..A-1)", "description": "<p>No of unemployed</p>", "templateType": "anything"}, "C": {"name": "C", "group": "Inputs", "definition": "random(2,3,4,5)", "description": "<p>no of children</p>", "templateType": "anything"}, "t": {"name": "t", "group": "Answers", "definition": "1.06+0.52*(A+C)+0.21*(1)-0.46*(B)", "description": "<p>trip rate per household</p>", "templateType": "anything"}, "EE": {"name": "EE", "group": "Inputs", "definition": "random(800..1800)", "description": "<p>no of car-owning hhs</p>", "templateType": "anything"}, "F": {"name": "F", "group": "Inputs", "definition": "int(EE*random(2.1..4.5#0.1))", "description": "<p>no of car-owning people</p>", "templateType": "anything"}, "H": {"name": "H", "group": "Inputs", "definition": "int(F*random(0.1..0.5#0.1))", "description": "<p>no of car-owning unemployed</p>", "templateType": "anything"}, "J": {"name": "J", "group": "Inputs", "definition": "random(400..2000)", "description": "<p>no of non-car hh</p>", "templateType": "anything"}, "K": {"name": "K", "group": "Inputs", "definition": "int(J*random(2.1..4.5#0.1))", "description": "<p>no of non-car people</p>", "templateType": "anything"}, "L": {"name": "L", "group": "Inputs", "definition": "int(K*random(0.2..0.7#0.1))", "description": "<p>no of non-car unemployed</p>", "templateType": "anything"}, "TCO": {"name": "TCO", "group": "Answers", "definition": "int(1.06*(EE) + 0.52*(F) + 0.21*(EE) - 0.46*(H))", "description": "<p>total trips by car-owning hhs</p>", "templateType": "anything"}, "TNC": {"name": "TNC", "group": "Answers", "definition": "int(1.06*(J) + 0.52*(K) - 0.46*(L))", "description": "<p>total trips by non-car hhs</p>", "templateType": "anything"}, "TT": {"name": "TT", "group": "Answers", "definition": "TCO+TNC", "description": "<p>total trips all hhs</p>", "templateType": "anything"}, "N": {"name": "N", "group": "Inputs", "definition": "random(5 .. 20#1)", "description": "<p>% increase in unemployed people</p>", "templateType": "randrange"}, "M": {"name": "M", "group": "Inputs", "definition": "N + random(5..15)", "description": "<p>% of car-owners selling cars</p>", "templateType": "anything"}, "E1": {"name": "E1", "group": "Ungrouped variables", "definition": "int(EE*(100-M)/100)", "description": "<p>new EE (no of car-own hh)</p>", "templateType": "anything"}, "HplusL1": {"name": "HplusL1", "group": "Ungrouped variables", "definition": "int((H+L)*(1+N/100))", "description": "<p>new total no of unemployed</p>", "templateType": "anything"}, "deltaT": {"name": "deltaT", "group": "Answers", "definition": "int(0.21*(EE-E1) + 0.46*(HplusL1 - (H+L)))", "description": "<p>decrease in total trips (positive)</p>", "templateType": "anything"}}, "variablesTest": {"condition": "deltaT>0", "maxRuns": 100}, "ungrouped_variables": ["E1", "HplusL1"], "variable_groups": [{"name": "Inputs", "variables": ["A", "B", "C", "EE", "F", "H", "J", "K", "L", "N", "M"]}, {"name": "Answers", "variables": ["t", "TCO", "TNC", "TT", "deltaT"]}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": true, "customName": "a)", "marks": "5", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>If a particular household had {A} adults of which {B} was unemployed, {C} children, and 1 car, estimate the daily number of trips it would generate.</p>", "minValue": "0.95*t", "maxValue": "1.05*t", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "dp", "precision": "2", "precisionPartialCredit": "100", "precisionMessage": "You have not given your answer to two decimals.", "strictPrecision": true, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "5", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>In a zone, there are two groups of households, car-owning and non-car owning households.</p>\n<table style=\"border-color: #000000; width: 441px;\">\n<tbody>\n<tr>\n<td style=\"width: 125px;\">Group</td>\n<td style=\"text-align: center; width: 78.25px;\">Number of <br/>households</td>\n<td style=\"text-align: center; width: 81.75px;\">Number of<br/>people</td>\n<td style=\"text-align: center; width: 89px;\">Number of <br/>unemployed</td>\n</tr>\n<tr>\n<td style=\"width: 125px;\">Car-owning</td>\n<td style=\"text-align: center; width: 78.25px;\">{EE}</td>\n<td style=\"text-align: center; width: 81.75px;\">{F}</td>\n<td style=\"text-align: center; width: 89px;\">{H}</td>\n</tr>\n<tr>\n<td style=\"width: 125px;\">Non-car owning</td>\n<td style=\"text-align: center; width: 78.25px;\">{J}</td>\n<td style=\"text-align: center; width: 81.75px;\">{K}</td>\n<td style=\"text-align: center; width: 89px;\">{L}</td>\n</tr>\n</tbody>\n</table>\n<p>Every car-owning household owns only one car. Estimate the total daily number of trips produced by car-owning households.</p>", "minValue": "0.95*TCO", "maxValue": "1.05*TCO", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "5", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>Estimate the total number of trips produced by non-car owning households.</p>", "minValue": "0.95*TNC", "maxValue": "1.05*TNC", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "3", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [{"variable": "TCO", "part": "p1", "must_go_first": true}, {"variable": "TNC", "part": "p2", "must_go_first": true}], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": "2", "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>What is the total number of trips produced in the zone?</p>", "minValue": "0.95*TT", "maxValue": "1.05*TT", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "7", "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "studentNumber (The student's answer, parsed as a number):\n    if(settings[\"allowFractions\"],\n        parsedecimal_or_fraction(studentAnswer,settings[\"notationStyles\"])\n    ,\n        parsedecimal(studentAnswer,settings[\"notationStyles\"])\n    )\n\nisInteger (Is the student's answer an integer?):\n    countDP(studentAnswer)=0\n\nisFraction (Is the student's answer a fraction?):\n    \"/\" in studentAnswer\n\nnumerator (The numerator of the student's answer, or 0 if not a fraction):\n    if(isFraction,\n        parseNumber(split(studentAnswer,\"/\")[0],settings[\"notationStyles\"])\n    ,\n        0\n    )\n\ndenominator (The numerator of the student's answer, or 0 if not a fraction):\n    if(isFraction,\n        parseNumber(split(studentAnswer,\"/\")[1],settings[\"notationStyles\"])\n    ,\n        0\n    )\n\ncancelled (Is the student's answer a cancelled fraction?):\n    assert(isFraction and gcd(numerator,denominator)=1,\n        assert(not settings[\"mustBeReduced\"],\n            multiply_credit(settings[\"mustBeReducedPC\"],translate(\"part.numberentry.answer not reduced\"))\n        );\n        false\n    )\n\ncleanedStudentAnswer:\n    cleannumber(studentAnswer, settings[\"notationStyles\"])\n\nstudentPrecision:\n    switch(\n        settings[\"precisionType\"]=\"dp\", max(settings[\"precision\"],countDP(cleanedStudentAnswer)),\n        settings[\"precisionType\"]=\"sigfig\", max(settings[\"precision\"],countsigfigs(cleanedStudentAnswer)),\n        0\n    )\n\nraw_minvalue:\n    switch(\n        settings[\"precisionType\"]=\"dp\", precround(settings[\"minvalue\"],studentPrecision),\n        settings[\"precisionType\"]=\"sigfig\", siground(settings[\"minvalue\"],studentPrecision),\n        settings[\"minvalue\"]\n    )\n\nraw_maxvalue:\n    switch(\n        settings[\"precisionType\"]=\"dp\", precround(settings[\"maxvalue\"],studentPrecision),\n        settings[\"precisionType\"]=\"sigfig\", siground(settings[\"maxvalue\"],studentPrecision),\n        settings[\"maxvalue\"]\n    )\n\nminvalue: min(raw_minvalue,raw_maxvalue)\n\nmaxvalue: max(raw_minvalue,raw_maxvalue)\n\nvalidNumber (Is the student's answer a valid number?):\n    if(isNaN(studentNumber),\n        warn(translate(\"part.numberentry.answer invalid\"));\n        fail(translate(\"part.numberentry.answer invalid\"))\n    ,\n        true\n    )\n\nnumberInRange (Is the student's number in the allowed range?):\n    if(abs(studentNumber)>=minvalue and abs(studentNumber)<=maxvalue,\n        correct()\n    ,\n        incorrect();\n        end()\n    )\n\ncorrectPrecision (Has the student's answer been given to the desired precision?):     \n    if(togivenprecision(studentanswer,settings['precisionType'],settings['precision'],settings[\"strictPrecision\"]),\n        true\n    ,\n        multiply_credit(settings[\"precisionPC\"],settings[\"precisionMessage\"]);\n        false\n    )\n\nmark (Mark the student's answer):\n    apply(validNumber);\n    apply(numberInRange);\n    assert(numberInRange,end());\n    if(isFraction,\n        apply(cancelled)\n    ,\n        apply(correctPrecision)\n    )\n \ninterpreted_answer (The student's answer, to be reused by other parts):\n    studentNumber", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>Poor economic conditions after lockdown cause {M}% of car-owning households in the zone to sell their car, and the number of unemployed people to increase by {N}%. By how many trips would the total productions decrease (assuming all other variables remain constant)?</p>", "minValue": "0.95*deltaT", "maxValue": "1.05*deltaT", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "type": "question"}]}, {"name": "Question 2", "pickingStrategy": "all-ordered", "pickQuestions": 1, "questions": [{"name": "Supply curves and average cost - conveyor belt vs trucks", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Christo Venter", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4933/"}], "tags": [], "metadata": {"description": "", "licence": "All rights reserved"}, "statement": "<p>Moria mine plans to produce coal for a nearby Eskom power station. The distance between the two is {D} kilometers. The mine has two options to transport coal to the power station: they can construct a conveyor belt system, or contract with trucking companies who charge them per tonne-kilometer transported. Each transport option has a physical capacity due to the size of the infrastructure. There is some uncertainty about the volume of coal the power station will need.&nbsp;</p>\n<p>The details for the two alternatives are:</p>\n<p><strong>Conveyor belt option</strong></p>\n<p>&nbsp; Fixed (capital) cost (annualised)&nbsp;&nbsp;&nbsp;&nbsp; R{Ccost_b} per year<br/>&nbsp; Operating cost&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; R{Ocost_b} per tonne-km<br/>&nbsp; Capacity&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {Cap_b} tonnes per year</p>\n<p><strong>Truck option</strong></p>\n<p>&nbsp; Operating cost&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; R{Ocost_t} per tonne-km<br/>&nbsp; Capacity&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {Cap_t} tonnes per year</p>", "advice": "", "rulesets": {}, "variables": {"D": {"name": "D", "group": "Inputs", "definition": "random(5 .. 35#1)", "description": "<p>distance</p>", "templateType": "randrange"}, "Ccost_b": {"name": "Ccost_b", "group": "Inputs", "definition": "D*425000", "description": "<p>Capital cost - belt</p>", "templateType": "anything"}, "Ocost_b": {"name": "Ocost_b", "group": "Inputs", "definition": "random(0.80..1.50#0.01)", "description": "<p>Op cost per t.km - belt</p>", "templateType": "anything"}, "Ocost_t": {"name": "Ocost_t", "group": "Inputs", "definition": "precround(Ocost_b*random(1.05..1.20#0.05),2)", "description": "<p>Op cost per t.km - truck</p>", "templateType": "anything"}, "Cap_b": {"name": "Cap_b", "group": "Inputs", "definition": "int(CriticalVolume*1.2/1000)*1000", "description": "<p>Annual Capacity - belt</p>", "templateType": "anything"}, "Cap_t": {"name": "Cap_t", "group": "Inputs", "definition": "int(CriticalVolume*1.5/1000)*1000", "description": "<p>Annual Capacity - truck</p>", "templateType": "anything"}, "CriticalVolume": {"name": "CriticalVolume", "group": "Ungrouped variables", "definition": "int(Ccost_b / (D*(Ocost_t - Ocost_b)))", "description": "<p>Critical volume (where avg cost_b = avg cost_t)</p>", "templateType": "anything"}, "Vol_low": {"name": "Vol_low", "group": "Inputs", "definition": "int(CriticalVolume*0.75/1000)*1000", "description": "<p>Volume (Low volume scenario)</p>", "templateType": "anything"}, "Vol_hi": {"name": "Vol_hi", "group": "Inputs", "definition": "int(CriticalVolume*1.3/1000)*1000", "description": "<p>Volume (High volume scenario)</p>", "templateType": "anything"}, "Acost_b": {"name": "Acost_b", "group": "Answers", "definition": "precround(Ccost_b / Vol_low + Ocost_b * D,2)", "description": "<p>Avg cost - belt at low volume scenario (R/t)</p>", "templateType": "anything"}, "Acost_t": {"name": "Acost_t", "group": "Answers", "definition": "precround(Ocost_t*D,2)", "description": "<p>Avg cost trucks (all volumes) (R/t)</p>", "templateType": "anything"}, "XAcost_b1": {"name": "XAcost_b1", "group": "Answers", "definition": "precround(((Ccost_b + Ocost_b * D * Cap_b)/ Vol_low),2)", "description": "<p>Wrong calc for avg cost - use capacity instead of volume</p>", "templateType": "anything"}, "XAcost_b2": {"name": "XAcost_b2", "group": "Answers", "definition": "precround(((Ccost_b + Ocost_b * D * Vol_low)/ Cap_b),2)", "description": "<p>Wrong calc for avg cost - use capacity instead of volume</p>", "templateType": "anything"}, "XAcost_t1": {"name": "XAcost_t1", "group": "Answers", "definition": "precround(((Ocost_t * D * Cap_t)/ Vol_low),2)", "description": "<p>Wrong calc for avg cost - use capacity instead of volume</p>", "templateType": "anything"}, "XAcost_t2": {"name": "XAcost_t2", "group": "Answers", "definition": "precround(((Ocost_t * D * Vol_low)/ Cap_t),2)", "description": "<p>Wrong calc for avg cost - use capacity instead of volume</p>", "templateType": "anything"}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["CriticalVolume"], "variable_groups": [{"name": "Inputs", "variables": ["D", "Ccost_b", "Ocost_b", "Ocost_t", "Cap_b", "Cap_t", "Vol_low", "Vol_hi"]}, {"name": "Answers", "variables": ["Acost_b", "Acost_t", "XAcost_b1", "XAcost_b2", "XAcost_t1", "XAcost_t2"]}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Calculate the expected average (unit) cost for each option, in Rands per tonne of coal transported, and plot the values on a graph on your answer sheet. Use two scenarios: low volume ({Vol_low} tonnes per year), and high volume ({Vol_hi} tonnes per year).</p>\n<p>For the low volume scenario, what is the average cost for the conveyor belt option?</p>\n<p>R[[0]] per tonne </p>", "gaps": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": "7", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "alternatives": [{"type": "numberentry", "useCustomName": true, "customName": "Wrong answer - use capacity instead of volume", "marks": "1", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "alternativeFeedbackMessage": "<p>You used capacity instead of volume when calculating average cost</p>", "useAlternativeFeedback": true, "minValue": "0.95*XAcost_b1", "maxValue": "1.05*XAcost_b1", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": true, "customName": "Wrong answer", "marks": "1", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "alternativeFeedbackMessage": "<p>You used capacity instead of volume when calculating average cost</p>", "useAlternativeFeedback": true, "minValue": "0.95*XAcost_b2", "maxValue": "1.05*XAcost_b2", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "minValue": "0.95*Acost_b", "maxValue": "1.05*Acost_b", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>For the low volume scenario, what is the average cost for the trucking option?</p>\n<p>R[[0]] per tonne</p>", "gaps": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": "5", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "alternatives": [{"type": "numberentry", "useCustomName": true, "customName": "Wrong answer - used capacity instead of volume", "marks": "1", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "alternativeFeedbackMessage": "<p>You used capacity instead of volume when calculating average cost</p>", "useAlternativeFeedback": true, "minValue": "0.95*XAcost_t1", "maxValue": "1.05*XAcost_t1", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": true, "customName": "Wrong answer 2", "marks": "1", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "alternativeFeedbackMessage": "<p>You used capacity instead of volume when calculating average cost</p>", "useAlternativeFeedback": true, "minValue": "0.95*XAcost_t2", "maxValue": "1.05*XAcost_t2", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "minValue": "0.95*Acost_t", "maxValue": "1.05*Acost_t", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "sortAnswers": false}, {"type": "1_n_2", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [{"variable": "Acost_b", "part": "p0g0", "must_go_first": true}, {"variable": "Acost_t", "part": "p1g0", "must_go_first": true}], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>For the low volume scenario, which option should be selected (based on costs alone)?</p>", "minMarks": 0, "maxMarks": 0, "shuffleChoices": false, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["Conveyor belt", "Trucks"], "matrix": ["if(Acost_t>Acost_b,2,0)", "5"], "distractors": ["", ""]}, {"type": "1_n_2", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Which of the two options 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