a reduction of 40 % in the price of apples would enable a man to obtain 64 more for rs . 40 , what is reduced price per dozen ?
"b 40 * ( 40 / 100 ) = 16 - - - 64 ? - - - 12 = > rs . 3"
multiply(divide(divide(multiply(40, 40), const_100), 64), const_12)