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If a sum on compound interest becomes 3 times in a certain number of years, then with the same interest rate, in how many years will it become 27 times?
  1. 9 years
  2. 12 years
  3. 6 years
  4. 18 years
Explanation

If a sum becomes 3 times in x years, and you're using compound interest, then:

  • In 2x years, it becomes time

  • In 3x years, it becomes time

So, if the sum triples in 4 years, it becomes 27 times in years.

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