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A sum of money trebles itself in 15 years, 6 months. In how many years would it double itself ?

Correct answer: B. 7 years 9 months

  • A. 6 years 3 months
  • B. 7 years 9 months
  • C. 8 years 3 months
  • D. 9 years 6 months

Explanation

If the principal trebles in 15 years 6 months, the interest earned is twice the principal in 15.5 years. To double, the interest must equal one principal, which takes half that time: 15.5 years ÷ 2 = 7.75 years = 7 years 9 months. Option a, 6 years 3 months, incorrectly uses a different fraction of the original period.

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