a reduction of 25 % in the price of oil enables a house wife to obtain 5 kgs more for rs . 500 , what is the reduced price for kg ?
"a 500 * ( 25 / 100 ) = 125 - - - - 5 ? - - - - 1 = > rs . 25"
divide(divide(multiply(500, 25), const_100), 5)