a reduction of 20 % in the price of salt enables a lady to obtain 10 kgs more for rs . 100 , find the original price per kg ?
"100 * ( 20 / 100 ) = 20 - - - 10 ? - - - 1 = > rs . 2 100 - - - 80 ? - - - 2 = > rs . 2.5 answer : c"
multiply(divide(divide(multiply(divide(20, const_100), 100), 10), multiply(divide(20, const_100), 100)), const_100)