find the compound interest on $ 26,000 at 20 % per annum for 9 months , compounded quarterly
"principal = $ 26000 ; time = 9 months = 3 quarters ; rate = 20 % per annum = 5 % per quarter . amount = $ [ 26000 x ( 1 + ( 5 / 100 ) ) ^ 3 ] = $ 30098.25 ci . = $ ( 30098.25 - 26000 ) = $ 4098.25 answer d ."
subtract(multiply(26,000, power(add(const_1, divide(9, const_100)), 20)), 26,000)