a furniture dealer purchased a desk for $ 120 and then set the selling price equal to the purchase price plus a markup that was 40 % of the selling price . if the dealer sold the desk at the selling price , what was the amount of the dealer ' s gross profit from the purchase and the sale of the desk ?
"purchase price = 120 selling price = x 120 + 0.4 * x = x 0.6 * x = 120 x = 200 profit = 200 - 150 = 50 answer : a"
divide(multiply(subtract(divide(120, subtract(const_1, divide(40, const_100))), 120), const_100), 120)