Question

If a sum of money becomes $n$ times with the rate of interest $(r \%)$, then

Answer 1

If a sum of money becomes $n$ times with the rate of interest $(r \%)$, then

$\text { Time }=\frac{100(n-1)}{r} \%$

Example : In what time does a sum of money become four times at the simple interest rate of $5 \%$ per annum?

$\text { Soln. : Time }=\frac{(4-1) \times 100}{5}=60 \text { years, Ans. }$