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Work out the average percentage increase per year in price of an item, given two prices several years apart.
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England schools
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England university
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Scotland schools
Taxonomy: mathcentre
Taxonomy: Kind of activity
Taxonomy: Context
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From users who are members of Transition to university :
Christian Lawson-Perfect
|
said | Ready to use | 7 years, 8 months ago |
Chris Graham
|
said | Needs to be tested | 7 years, 8 months ago |
| Stanislav Duris | said | Needs to be tested | 7 years, 8 months ago |
History
Christian Lawson-Perfect 7 years, 8 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect 7 years, 8 months ago
Saved a checkpoint:
Used the currency function to make sure prices are displayed properly (two d.p. when not a whole number of pounds)
Good question!
Chris Graham 7 years, 8 months ago
Gave some feedback: Needs to be tested
Chris Graham commented 7 years, 8 months ago
I have changed "percentage multiplier" to "decimal multiplier" in the step and advice. Also changed the advice so that the percentage change is calculated first. Asking the student to multiply by 100 then subtract 100 in one step meant that they skipped completely the idea of, say, a 108% change in the value.
I've removed some variables which were strange / not required.
Chris Graham 7 years, 8 months ago
Gave some feedback: Has some problems
Chris Graham commented 7 years, 8 months ago
Too many decimal places are retained in the advice. In two places (step and advice), x is referred to as the "percentage multiplier". Unless I'm out of touch with the terminology, I would call this a decimal multiplier.
Stanislav Duris 7 years, 8 months ago
Published this.Stanislav Duris 7 years, 8 months ago
Saved a checkpoint:
This question should be good to go. If not, the only thing I can think of as an advice is maybe you can adjust the first part of advice so that if years = 2, the latex does not display the 2 while calculating the root. This would be done via conditional visibility but I don't think doing this is necessarily essential. Maybe playing around with numbers would change things (the rounding could result in slightly different correct answers), so make sure that slight errors are allowed if that happens.
Stanislav Duris commented 7 years, 8 months ago
This question was originally a part c) in question Exponential increase and decrease.
Stanislav Duris 7 years, 8 months ago
Gave some feedback: Needs to be tested
Stanislav Duris 7 years, 8 months ago
Created this as a copy of Cumulative percent decrease.| Name | Status | Author | Last Modified | |
|---|---|---|---|---|
| Simple interest | Ready to use | Stanislav Duris | 20/11/2019 14:42 | |
| Cumulative percent decrease | Ready to use | Stanislav Duris | 20/11/2019 14:36 | |
| Exponential increase | Ready to use | Stanislav Duris | 20/11/2019 14:38 | |
| Ida's copy of Cumulative percent decrease | draft | Ida Landgärds | 12/04/2018 10:54 | |
| Spørsmål 4 | draft | Ida Landgärds | 02/12/2020 15:42 | |
| haifa's copy of Cumulative percent decrease | draft | haifa abd | 01/05/2018 14:20 | |
| Consumer Arithmetic - Simple Interest | draft | Paul Hancock | 24/07/2018 03:08 |
There are 9 other versions that do you not have access to.
| Name | Type | Generated Value |
|---|
| ori | number |
3.99
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| new | number |
6.02
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| perc | number |
7.1
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| years | integer |
6
|
||||
| x | number |
1.0710
|
Generated value: number
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