a person ' s salary is getting reduced by 20 % . what percentage should be added to get back his original salary ?
salary he get after reduced 20 % = 100 - 20 % = 80 % so , percentage should be added to get back his salary = ( 20 / 80 ) * 100 = 25 % answer : a
multiply(subtract(divide(const_1, subtract(const_1, divide(20, const_100))), const_1), const_100)