A、The bookstore pays 50% of their original value for the books if the professor changes texts. B、The bookstore pays 50% of their

W: That comes to $160.
M: One hundred and sixty dollars! I just can’t believe how expensive textbooks are. And that’s just for required texts. Why, if I have to buy all the books on my suggested reading lists, I’d have to take out a bank loan!
W: You could save some money if you buy used texts, you know.
M: I suppose, but it’s hard for me to study from a text that’s been marked up. Tell me, if I don’t need some of these books, can I get a full refund?
W: Sure, if the professor changes his mind about a book or if you drop a course, just return it and we’ll give you your money back—but only for the first three weeks of class. So don’t write your name in the text or mark it up until you’re sure you’re going to keep it all semester.
M: And what about at the end of the semester? What’s your buy-back policy?
W: As long as the books are in reasonably good condition, and they’re going to be used in class the next semester, we’ll give you 50% of their original value—even if you don’t buy them at this store. Of course, if a professor changes texts or if a new edition comes out, we won’t buy them back at all.
M: Fifty percent—that’s all?
W: Well, I suppose that doesn’t sound like much, but that’s the store policy.