a reduction of 30 % in the price of apples would enable a man to obtain 54 more for rs . 30 , what is reduced price per dozen ?
"b 30 * ( 30 / 100 ) = 9 - - - 54 ? - - - 12 = > rs . 2"
multiply(divide(divide(multiply(30, 30), const_100), 54), const_12)