a person buys an article at rs . 500 . at what price should he sell the article so as to make a profit of 50 % ?
"cost price = rs . 500 profit = 50 % of 500 = rs . 250 selling price = cost price + profit = 500 + 250 = 750 answer : a"
add(500, multiply(500, divide(50, const_100)))