a person buys an article at rs . 500 . at what price should he sell the article so as to make a profit of 30 % ?
"cost price = rs . 500 profit = 30 % of 500 = rs . 150 selling price = cost price + profit = 500 + 150 = 650 answer : a"
add(500, multiply(500, divide(30, const_100)))