Perez sees an advertisement in the newspaper indicating that the ABC Corp. is offering for sale a two-volume set of books, How to Make Repairs around the House, for $39.95. All Perez has to do is send in a card requesting delivery of the books for a thirty-day trial period. If he does not ship the books back within thirty days of delivery, ABC will bill him for $39.95. Discuss whether Perez and ABC have a contract under either of the following circumstances:
(a) Perez sends in the card and receives the books in the U.S. mail. He uses the books to make repairs and fails to return them within thirty days.
(b) Perez does not send in the card, but ABC sends him the books anyway through the U.S. mail. Perez uses the books and fails to return them within thirty days.