the salary of a person was reduced by 20 % . by what percent should his reduced salary be raised so as to bring it at par with his original salary ?
"let the original salary be $ 100 new salary = $ 80 increase on 80 = 20 increase on 100 = 20 / 80 * 100 = 25 % answer is c"
multiply(divide(multiply(const_100, divide(20, const_100)), subtract(const_100, multiply(const_100, divide(20, const_100)))), const_100)