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The sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself?

Correct answer: D. 6

  • A. 18
  • B. 12
  • C. 9
  • D. 6

Explanation

The amount becomes 3 times in 3 years, so each 3-year interval multiplies the principal by 3. To become 9 times, which is 3^2, two such intervals are needed: 2 x 3 years = 6 years. The likely mistake is choosing option c, 9 years, by multiplying the target factor by the given time instead of counting the two tripling periods.

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