after giving a discount of rs . 45 the shopkeeper gets a loss of 10 % , if the cost price is rs . 180 . find the markup % ?
"cost price = 180 s . p = 180 * 90 / 100 = 162 disc = 45 so . . . mark price = 162 + 45 = 207 . . . . . . mark up % = 207 - 180 / 180 = 81 / 180 = . 15 or 15 % answer : e"
divide(subtract(add(add(180, divide(180, divide(const_100, 10))), 45), 180), 180)