the salary of a worker is first increased by 25 % and afterwards reduced by 25 % . what is the net change in the worker ' s salary ?
"let x be the original salary . the final salary is 0.75 ( 1.25 x ) = 0.9375 x the answer is d ."
subtract(const_100, subtract(add(25, const_100), divide(multiply(add(25, const_100), 25), const_100)))