find the compound interest on $ 66,000 at 20 % per annum for 9 months , compounded quarterly
"principal = $ 66000 ; time = 9 months = 3 quarters ; rate = 20 % per annum = 5 % per quarter . amount = $ [ 66000 x ( 1 + ( 5 / 100 ) ) ^ 3 ] = $ 76403.25 ci . = $ ( 76403.25 - 66000 ) = $ 10403.25 answer d ."
subtract(multiply(66,000, power(add(const_1, divide(9, const_100)), 20)), 66,000)