Question

During a sale at a bookstore, Joseph buys a book at full price. He is given a 50 percent discount on a second book of equal or less value. If Joseph buys two books that have a full price of $15 and $10, by what percent is the total cost of the two books reduced during the sale? (A) 5% (B) 20% (C) 25% (D) 30% (E) 50%

Answer 1

Total cost of books was 15 + 10 or 25.  With the 50 % discount on the $10 book, the total is now $20. The total cost was reduced by (B) 20%.
 $5 off the $25 price is a 20% discount.