a fruit seller sells mangoes at the rate of rs . 5 per kg and thereby loses 20 % . at what price per kg , he should have sold them to make a profit of 5 %
"explanation : 80 : 5 = 105 : x x = ( 5 × 105 / 80 ) = rs 6.56 option a"
divide(multiply(5, add(const_100, 5)), subtract(const_100, 20))