Question

8000 for 1 years at 9% per annum compounded half yearly

Answer 1

interest= P*R*T
---------
100

interest=8000*1*9
-------------
100


interest=8000*9
-----------
100

interest=72000
----------
100

interest= 720

hope my answer help you

Answer 2

Given
Principle = Rs 8000
time = 1-year
rate of interest =  9%

Amount = principle (1 + rate of interest/100)^time
Amount = 8000(1 + 9/100)^1
              = 8000(109/100)
              = Rs 8720.

Compound Interest = Amount - principle
                                 = 8720 - 8000
                                 = Rs 720

The C.I is Rs 720 and amount is Rs 8720.

Hope my answer helps you.