// Numbas version: finer_feedback_settings
{"name": "Calculate the financial and carbon cost each year to turn the heating up", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Calculate the financial and carbon cost each year to turn the heating up", "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "<div class=\"TextLayer-container\">\n<div class=\"textLayer\">\n<p data-start=\"0\" data-end=\"155\">Calculate the extra financial cost and carbon emissions over a year if the heating is increased from <strong data-start=\"101\" data-end=\"122\">{temperature_low}</strong>&deg;C to <strong data-start=\"128\" data-end=\"150\">{temperature_high}</strong>&deg;C.</p>\n<p data-start=\"157\" data-end=\"165\">Given:</p>\n<ul data-start=\"166\" data-end=\"508\" data-is-last-node=\"\">\n<li data-start=\"166\" data-end=\"208\">Total gas use: <strong data-start=\"183\" data-end=\"202\">{total_gas_use}</strong>kWh</li>\n<li data-start=\"209\" data-end=\"285\">Space heating accounts for <strong data-start=\"238\" data-end=\"266\">{percent_space_heating}%</strong> of total gas use</li>\n<li data-start=\"286\" data-end=\"401\">A <strong data-start=\"290\" data-end=\"297\">1&deg;C</strong> increase in temperature adds <strong data-start=\"327\" data-end=\"370\">{percent_increase_heating_consumption}%</strong> to space heating consumption</li>\n<li data-start=\"402\" data-end=\"442\">Gas price: <strong data-start=\"415\" data-end=\"434\">{gas_price*100}</strong>p/kWh</li>\n<li data-start=\"443\" data-end=\"508\" data-is-last-node=\"\">Gas carbon emissions: <strong data-start=\"467\" data-end=\"493\">{carbon_emissions_gas}</strong> kg CO\u2082 per kWh</li>\n</ul>\n<br/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></div>\n</div>", "advice": "<div class=\"textLayer\">\n<div class=\"TextLayer-container\">\n<div class=\"textLayer\"><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Rise in gas consumption</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">{total_gas_use}kWh x {percent_increase_heating_consumption}% = {gas_consumption_increase}kWh</span></div>\n<div class=\"textLayer\"><br role=\"presentation\" class=\"textLayer--absolute\"/><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Cost of extra gas consumption</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">{gas_consumption_increase}kWh x &pound;{gas_price}/kWh = &pound;{extra_cost_gas_consumption}</span></div>\n<div class=\"textLayer\"><br role=\"presentation\" class=\"textLayer--absolute\"/><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Carbon emissions of extra gas</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">{gas_consumption_increase}kWh x {carbon_emissions_gas}kg/kWh = {extra_carbon_gas_consumption}kg</span>\n<div class=\"endOfContent textLayer--absolute\"></div>\n</div>\n</div>\n</div>\n<div class=\"textLayer\"></div>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"temperature_low": {"name": "temperature_low", "group": "Ungrouped variables", "definition": "temperature_high - 1", "description": "<p>Lower temperature in celsius.&nbsp;</p>", "templateType": "anything", "can_override": false}, "total_gas_use": {"name": "total_gas_use", "group": "Ungrouped variables", "definition": "random(300000 .. 500000#10000)", "description": "<p>Total gas use in kWh.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "percent_space_heating": {"name": "percent_space_heating", "group": "Ungrouped variables", "definition": "random(60 .. 95#5)", "description": "<p>Percentage of total gas use that is space heating.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "percent_increase_heating_consumption": {"name": "percent_increase_heating_consumption", "group": "Ungrouped variables", "definition": "random(3 .. 15#1)", "description": "<p>Increase to space heating consumption after a one degree rise, in percent.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "gas_price": {"name": "gas_price", "group": "Ungrouped variables", "definition": "random(0.03 .. 0.07#0.001)", "description": "<p>The price of gas in &pound;'s.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "carbon_emissions_gas": {"name": "carbon_emissions_gas", "group": "Ungrouped variables", "definition": "random(0.15 .. 0.2#0.001)", "description": "<div class=\"TextLayer-container\">\n<div class=\"textLayer\"><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Gas carbon emissions, kg CO2 per kWh.</span>\n<div class=\"endOfContent textLayer--absolute\"></div>\n</div>\n</div>", "templateType": "randrange", "can_override": false}, "gas_consumption_increase": {"name": "gas_consumption_increase", "group": "Ungrouped variables", "definition": "total_gas_use*percent_increase_heating_consumption/100", "description": "<p>Variable to store the rise in gas consumption calculation.</p>", "templateType": "anything", "can_override": false}, "extra_cost_gas_consumption": {"name": "extra_cost_gas_consumption", "group": "Ungrouped variables", "definition": "gas_consumption_increase*gas_price", "description": "<p>Variable to store the cost of extra gas consumption calculation.</p>", "templateType": "anything", "can_override": false}, "extra_carbon_gas_consumption": {"name": "extra_carbon_gas_consumption", "group": "Ungrouped variables", "definition": "gas_consumption_increase*carbon_emissions_gas", "description": "<p>Variable to store the carbon emissions of extra gas consumption calculation.</p>", "templateType": "anything", "can_override": false}, "temperature_high": {"name": "temperature_high", "group": "Ungrouped variables", "definition": "random(18 .. 21#1)", "description": "<p>Higher temperature in celsius.&nbsp;</p>", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["temperature_low", "total_gas_use", "percent_space_heating", "percent_increase_heating_consumption", "gas_price", "carbon_emissions_gas", "gas_consumption_increase", "extra_cost_gas_consumption", "extra_carbon_gas_consumption", "temperature_high"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Cost of extra gas consumption, in &pound;:</p>", "minValue": "extra_cost_gas_consumption", "maxValue": "extra_cost_gas_consumption", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "dp", "precision": "2", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": true, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Carbon emissions of extra gas, in kg:</p>", "minValue": "extra_carbon_gas_consumption", "maxValue": "extra_carbon_gas_consumption", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "dp", "precision": "2", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": true, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Simon Stuttaford", "profile_url": 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