Multiple choice

A certain sum on simple interest becomes 3 times in 6 years .In how many years it will be become 8 times?

  1. 21

  2. 25

  3. 23

  4. 27
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If money becomes 3 times in 6 years, the simple interest earned is 2 times the principal (since Amount = Principal + Interest). Interest for 6 years = 2P, so annual interest = 2P/6 = P/3. To become 8 times, interest needed = 7P. Time needed = 7P ÷ (P/3) = 21 years.

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