Question

The time in which a certain amount is doulbled at the rate of 10% s.i. is........

Answer 1

let the amount be 2 rs
principle be 1rs
T= I*100/P*R
= 2*100/1*10= 20 YRS answer

Answer 2

let the amount be 100
Amount=200
simple interest =200-100
=Rs100
100=100×x×10/100
x=10 years