Multiple choice

Within how many years, a sum of money at a certain rate of compound interest shall become eight times if it doubles in 7 year?

  1. 21

  2. 22

  3. 23

  4. 24

  5. 25
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(Whatever be the sum, it doubles in 7 years; in another 7 years, it will become 4 times & again in 7 years it becomes 8 times. Hence in 21 years, the sum will be 8 times.)

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