Question

find the CI on 5000 at the rate of 10% p.a compounded semi annually for 1whole 1/2
years?

Answer 1

To find compound interest when interest is compounded half yearly, we use the following formula. 

A = P ( 1 + r/2)2n and C.I = A - P 

where, P = principal 
R = rate in percent p.a.( per annum i.e. annually)
n = number of years.

Answer 2

A=p(1+r/2)2n

CI=A-P

Then you genius you can find CI

Okay