In How much time? If

A certain sum of money doubles itself in 5 years at S.I. in how many years it becomes 7 times itself?

  1. 10 years
  2. 20 years
  3. 30 years
  4. 32 years
Monis Rasool Professor Asked on 23rd May 2015 in Maths.
Add Comment
  • 1 Answer(s)

    Answer: (c) 30 years
    Explanation:-

    Let the principal is X

    According to question, money doubles itself in 5 years
    then S I = 2X – X = X

    Now, we can find the rate
    X = (X x R x 5)/100
    R = 20%

    Again X becomes 7 times itself, then S I = 7X – X = 6X
    6X = (X x 20 x T)/100
    T = 30 years

    Hence, in 30 years it becomes 7 times itself.

    Anurag Mishra Professor Answered on 23rd May 2015.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.