A sum doubles in 8 years at compound interest. In how many years will the sum become 4 times the original sum if the interest is compounded annually?

  • Option 1)

    16

  • Option 2)

    20

  • Option 3)

    64

  • Option 4)

    32

  • Option 5)

    24

Answers (1)
R rishi raj

if time is constant then , the ratio of principal and amount is always constant in compound interest .

in 8 years sum become double i.e p becomes 2p

8+8 = 16 years

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