Question

At what rate per cent per annum wil Rs 630 produce an intrest of Rs.126 in 4 years?

Answer 1

let rate be r
SI= p*r*t/100
126=630*r*4/100
126*100/630*4=r
126*10/63*4=r
2*10/4=r
10/2=r
5=r



ans: rate= 5%

Answer 2

principal=Rs630.
Simple interest=Rs126.
Time=4 years
let rate be x.

SI=P×R×T/100.
126=630×x×4/100
126=63x×2/5
126×5=126x.
630=126x.
x=630/126
=5

therefore rate =5%.