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10 000 invested at 10 per cent for 5 years grows to about

  • A.15 000
  • B.37 910
  • C.16 105
  • D.6209

Answer: C

Correct answer: 16 105

\[ F = 10\,000\,(1.10)^5 = 10\,000 \times 1.6105 = 16\,105. \] Simple interest would have given 15 000, and the difference of 1105 is the interest earned on interest - small over five years and dominant over thirty, which is the whole argument of compounding.

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