0580/41 Oct/Nov 2025, Question 22: Compound interest
Cambridge IGCSE Mathematics 0580 · Paper 41 (Extended) · Calculator · 3 marks
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The question, in short
$200 is invested at r% per year compound interest and is worth $301.10 after 25 years. Find r.
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Solution · 3 marks
- 1200 × (1 + r/100)²⁵ = 301.10
- 21 + r/100 = ²⁵√(301.10 ÷ 200) = 1.016499…
- 3r = 1.6499… ≈ 1.65
Answer1.65 or 1.6499…
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