A store marks up a shirt by 40% and then puts it on sale for 20% off. If the shirt originally cost the store 15, what is the final sale price?
Correct: A
The shirt is marked up by 40%, so the new price is 15 + 0.40 * 15 = 15 + 6 = 21. Then it's discounted by 20%, so the final price is 21 - 0.20 * 21 = 21 - 4.20 = 16.80.