a reduction of 25 % in the price of oil enables a house wife to obtain 5 kgs more for rs . 600 , what is the reduced price for kg ?
"a 600 * ( 25 / 100 ) = 150 - - - - 5 ? - - - - 1 = > rs . 30"
divide(divide(multiply(600, 25), const_100), 5)