Question

interest on 3500 for 2 years when the interest is compounded annually at the rate of 20% per annum

Answer 1

I think it's your answer of this question

Answer 2

Principal = 3500rs.
Rate = 20%
Time = 2
In compound Interest =
A= p(1+r/100)²
A = 3500(1+20/100)²
A = 3500*120/100*120/100
A= 5,040rs.
CI = A-P
CI = 5,040-3500= 1,540 R.s.

Hope it may help you