Question

the simple interest in 3 years and compund interest in 2 years on a certain sum at the same rate are rs 1200 and rs 832 respectively
find:the rate of interest
     the principal
     the differnce betwenn ci and si for 3 years

Answer 1

let principal=rs 100x
let rate of interest=r pc per annum
by the problem,
(100x*3*r)/100=1200
or,rx=400
again,100x*(1+r/100)^2-100x=832
or,rx*(r/100+2)=832
or,r=8
thus,100x=rs 5000
hope you can do the rest