0580/22 Feb/Mar 2021, Question 13: Compound Interest
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 2 marks
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The question, in short
Given a butterfly population of 125.9 million at end of 2014 falling exponentially by 34% yearly, calculate the population at end of 2019.
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Solution · 2 marks
- 1Multiplier = 1 − 0.34 = 0.66
- 22014 to 2019 = 5 years
- 3125.9 × 0.66⁵ = 15.766…
- 4≈ 15.8 million
Answer15.8 or 15.76 to 15.77
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