Multiple choice

A sum of money doubles itself at a certain rate of simple interest in 7.5 years. In how many years will it double at the same rate?

  1. 21

  2. 22

  3. 21.5

  4. 22.5

  5. 23
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(We want to know that if the sum of money, say, Rs.100 becomes Rs.200 in 7.5 years, then in how many years it will become Rs.400. The simple interest earned is Rs.300 & this will amount to in 3 X 7.5 years, i. e. 22.5 years)

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