Math word problem? Five start!?

C. because you add the percentage off to the price itself when you want to go up in the price. For example, when we find the percentage of something we multiply the price (50) times the percentage (45%). But instead of a whole number, we move the decimal to the left twice, so it would be .45 when it comes to percentage. 50 x .45 = 22.50, so you would think it's A.. But then again we're finding the percentage up in price, so we add the 22.50 to the 50, making it C, 72.50.