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Date May 2021 Marks available 2 Reference code 21M.1.AHL.TZ2.5
Level Additional Higher Level Paper Paper 1 Time zone Time zone 2
Command term Estimate Question number 5 Adapted from N/A

Question

Roger buys a new laptop for himself at a cost of £495. At the same time, he buys his daughter Chloe a higher specification laptop at a cost of £2200.

It is anticipated that Roger’s laptop will depreciate at a rate of 10% per year, whereas Chloe’s laptop will depreciate at a rate of 15% per year.

Roger and Chloe’s laptops will have the same value k years after they were purchased.

Estimate the value of Roger’s laptop after 5 years.

[2]
a.

Find the value of k.

[2]
b.

Comment on the validity of your answer to part (b).

[1]
c.

Markscheme

£495×0.95=£292  (£292.292)        (M1)A1 


[2 marks]

a.

£495×0.9k=2200×0.85k        (M1)

k=26.1  26.0968        A1 


Note: Award M1A0 for k-1 in place of k.

[2 marks]

b.

depreciation rates unlikely to be constant (especially over a long time period)        R1


Note: Accept reasonable answers based on the magnitude of k or the fact that “value” depends on factors other than time.


[1 mark]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 2—Functions » SL 2.4—Key features of graphs, intersections using technology
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Topic 1—Number and algebra » SL 1.4—Financial apps – compound interest, annual depreciation
Topic 1—Number and algebra
Topic 2—Functions

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