You’ve added $50 to your cart, and once you decide to finish your order, you notice you get a Free Shipping (no extra cost of delivery), leaving the final price of the order at $50.
You've added $50 to your cart, but you get a 20% discount on the original price, setting the new value to $40. To finish the order, you'll need to pay a $10 delivery fee (extra cost of delivery), leaving the final price of the order at $50.