a reduction of 21 % in the price of salt enables a lady to obtain 10 kgs more for rs . 100 , find the original price per kg ?
"100 * ( 21 / 100 ) = 21 - - - 10 ? - - - 1 = > rs . 2.1 100 - - - 79 ? - - - 2.1 = > rs . 2.66 answer : a"
multiply(divide(divide(multiply(divide(21, const_100), 100), 10), multiply(divide(21, const_100), 100)), const_100)