the salary of a worker is first increased by 15 % and afterwards reduced by 15 % . what is the net change in the worker ' s salary ?
"let x be the original salary . the final salary is 0.85 ( 1.15 x ) = 0.9775 x the answer is d ."
subtract(const_100, subtract(add(15, const_100), divide(multiply(add(15, const_100), 15), const_100)))