Problem: a person lent a certain sum of money at 5 % per annum at simple interest and in 8 years the interest amounted to $ 480 less than the sum lent . what was the sum lent ?
Rationale: "p - 480 = ( p * 5 * 8 ) / 100 p = 800 the answer is b ."
annotated_formula: divide(480, subtract(const_1, divide(multiply(5, 8), const_100)))