a reduction of 35 % in the price of apples would enable a man to obtain 42 more for rs . 20 , what is reduced price per dozen ?
"a 20 * ( 35 / 100 ) = 6 - - - 42 ? - - - 12 = > rs . 1.7"
multiply(divide(divide(multiply(35, 20), const_100), 42), const_12)