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4MA1/1H Jun 2018, Question 7: Compound Interest

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1H (Higher) · Calculator · 6 marks

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The question, in short

Calculate a boat's value after 4% yearly depreciation over 3 years, and find Jalina's original salary given a 5% rise to HK$252 000.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 3 marks

Find the boat's value at the end of 3 years after 4% annual depreciation from HK$160 000, rounded to the nearest HK$.

  1. 1160 000 × 0.96 = 153 600
  2. 2153 600 × 0.96 = 147 456
  3. 3147 456 × 0.96 = 141 557.76
  4. 4141 557.76 ≈ 141 558

Answer141 558

Part (b) · 3 marks

Work out Jalina's salary before a 5% increase, given her new salary is HK$252 000.

  1. 1After a 5% increase, new salary = 1.05 × old salary.
  2. 2Old salary = 252 000 ÷ 1.05 = 240 000

Answer240 000

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