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.
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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.
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