A sum of money doubles itself in 7 years

Asked by admin @ 13/08/2021 in Math viewed by 320 People

Sum of money double itself in 7 years at a simple interest.how many years it will become fourfold

Answered by admin @ 13/08/2021

For S.I if it doubles then n×r=100

Sub n=7

7×r=100;

r=100/7

Then for four times

n×r=300

Sub the value of r then

n×100/7=300

Solving the above we get n= 21

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