a bookstore is having a three-day sale that offers customers a 20 percent discount on all items. Alex finds several books by his favorite autor on sale for $14

Question

A bookstore is having a three-day sale that offers customers a 20 percent discount on all items.  Alex finds several books by his favorite author on sale for $14.75 each.  What is the final price of four books, including 6 percent sale tax?

Answer 1

I am going to assume that the $14.75 takes place before the sale takes place.

100% - 20% = 80% ⇒ 0.8

14.75 * 0.8 = 11.8

So each book costs 11.8 post-discount.

 

11.8 * 4 = 47.2

So the cost of the books alone is $47.20

 

100% + 6% = 106% ⇒ 1.06

47.2 * 1.06 will be your final answer.