a reduction of 10 % in the price of salt enables a lady to obtain 20 kgs more for rs . 400 , find the original price per kg ?
"answer : 400 * ( 10 / 100 ) = 40 - - - 20 ? - - - 1 = > rs . 2 400 - - - 360 ? - - - 2 = > rs . 2.22 . answer : c"
multiply(divide(divide(multiply(divide(10, const_100), 400), 20), multiply(divide(10, const_100), 400)), const_100)