0580/21 Oct/Nov 2023, Question 13: Compound Interest
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Calculator · 3 marks
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The question, in short
Starting from 27000 wild rhinos at end of 2021, decreasing exponentially by 3% yearly, find the expected number at end of 2025, to the nearest whole number.
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Solution · 3 marks
- 1Multiplier = 1 − 3/100 = 0.97
- 227 000 × 0.97⁴ = 23 902.9…
- 3≈ 23 903
Answer23 903
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