Question

find the compound intrest on rs 8000 for 9 month at 20%per annum compound qaditraly

Answer 1

I think you want to write 'quarterly '.
is it helpful? . . . . . . . .

Answer 2

Find the number of quarters:

3 months = 1 quarter of a year

9 months = 3 quarters

Find the interest from one quarter:

1 year = 20%

3 months = 20 ÷ 4 = 5%

Find the amount after 3 quarters:

A = P(1 + r)ⁿ

A = 8000( 1 + 0.05)³

A = Rs 9261

Find the interest:

Interest = 9261 - 8000 = Rs 1261

Answer: The interest is Rs 1261