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4024/22 May/Jun 2020, Question 1: Percentage Increases and Decreases

Cambridge O Level Mathematics 4024 · Paper 22 (Calculator) · Calculator · 6 marks

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The question, in short

Calculate a percentage rise in income, simple interest over 3 years, and a currency conversion from INR to dollars, rounding the money answer to the nearest dollar.

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

Part (a) · 2 marks

Find the percentage increase from an income of $21 500 to $22 790.

  1. 1Increase = 22 790 − 21 500 = 1290
  2. 21290/21 500 × 100 = 6%

Answer6

Part (b) · 2 marks

Find the total amount after 3 years when $1260 earns simple interest at 2.5% per year.

  1. 1Interest = 1260 × 2.5/100 × 3 = 94.50
  2. 2Amount = 1260 + 94.50 = $1354.50

Answer1354.50

Part (c) · 2 marks

Convert 4300 INR to dollars at $1 = 67.8 INR, giving the answer to the nearest dollar.

  1. 14300 ÷ 67.8 = 63.42…
  2. 2$63

Answer63

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