a fruit seller sells mangoes at the rate of rs . 13 per kg and thereby loses 25 % . at what price per kg , he should have sold them to make a profit of 15 % ?
"solution 75 : 13 = 115 : x x = ( 13 ã — 115 / 75 ) = rs . 19.93 hence , s . p per kg = rs . 19.93 answer b"
divide(multiply(13, add(const_100, 15)), subtract(const_100, 25))