Problem: a man took loan from a bank at the rate of 12 % p . a . s . i . after 20 years he had to pay rs . 1500 interest only for the period . the principal amount borrowed by him was ?
Rationale: principal = ( 100 * 1500 ) / ( 12 * 20 ) = rs . 625 answer : a
annotated_formula: divide(divide(multiply(1500, const_100), 20), 12)