a fellow borrowed a certain sum of money at 8 % per annum at simple interest and in 8 years the interest amounted to rs . 900 less than the sum lent . what was the sum lent ?
"p - 900 = ( p * 8 * 8 ) / 100 p = 2500 answer : c"
divide(900, subtract(const_1, divide(multiply(8, 8), const_100)))