A: May I help you? B: I would like to check out these books. A: May I see your library card, please? B: Yes. Here you go. A: Apparently, you have unpaid late fees. B: I do? A: You owe some money. B: Exactly how much do I owe? A: You owe $24.50. B: I won't be able to pay that right now. A: Until you pay it, you can't check out books. B: I will pay it. Don't worry.