Question: A sum of money placed at compound interest (compounding annually) doubles itself in 10 years. find the time in which it will amount to 4 times itself.

  1. 10 years
  2. 15 years
  3. 14 years
  4. 20 years

Answer: 20 years

Solution:
Time is directly proportional to amount.
As amount is doubled in 10 years so amount will 4 times in next 10 years.

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