Question

. An amount becomes 7 times in 15 years. In how many years will the same amount becomes 10 times? (The rate of interest remains the same for both cases)

Answer 1

Answer:

Let P be x

A=7x

I=7x-x

I=6x

6x=(x*r*15)/100

6x=15rx/100

r=(6*100)/15

r=40%

Now.

A=10x

I=10x-x

I=9x

9x=(x*r*t)/100

9x=40xt/100

t=900/40

t=22.5 years