after giving a discount of rs . 50 the shopkeeper gets a profit of 20 % , if the cost price is rs . 500 . find the marked price % ?
"cost price = 500 s . p = 500 * 120 / 100 = 600 disc = 50 so . . . mark price = 600 + 50 = 650 . . . . . . answer : e"
divide(subtract(add(add(500, divide(500, divide(const_100, 20))), 50), 500), 500)