a reduction of 25 % in the price of oil enables a house wife to obtain 5 kgs more for rs . 900 , what is the reduced price for kg ?
"a 900 * ( 25 / 100 ) = 225 - - - - 5 ? - - - - 1 = > rs . 45"
divide(divide(multiply(900, 25), const_100), 5)