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4024/22 Oct/Nov 2025, Question 5: Simple Interest

Cambridge O Level Mathematics 4024 · Paper 22 (Calculator) · Calculator · 3 marks

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The question, in short

Work out simple interest on $400 at 2.8% for 3 years, then compare yearly interest with a rate 0.4% higher.

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

Part (a) · 2 marks

Find the total simple interest earned on $400 over 3 years at 2.8% per year.

  1. 1Interest per year = 400 × 2.8/100 = $11.20
  2. 2Interest for 3 years = 11.20 × 3 = $33.60

Answer33.60

Part (b) · 1 mark

Find the extra yearly interest on $400 when the rate is 0.4% above Sofia's.

  1. 1Extra interest per year = 400 × 0.4/100 = $1.60

Answer1.60

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