Question

In how much time, will a sum of money double itself at $12.5\%$ per annum rate of interest.

Answer 1

Let principal be x
rate= 12.5 %
amount =2x
simple interest =2x-x =x
SI = P*R*T/100
x= x*12.5*T/100
T = 100/12.5
T = 8 years
Time = 8 years