a person lent a certain sum of money at 6 % per annum at simple interest and in 8 years the interest amounted to $ 520 less than the sum lent . what was the sum lent ?
"p - 520 = ( p * 6 * 8 ) / 100 p = 1000 the answer is b ."
divide(520, subtract(const_1, divide(multiply(6, 8), const_100)))