Patrick: I'd like to buy a bottle of Centrum, a dozen tooth brushes, some baby's wipes, and a small bottle of aspirin.

Clerk: Centrum? We have bottles of thirty and one hundred tablets. Which kind do you want?

Patrick: Give me one bottle of one hundred tablets.

Clerk: And what kind of toothbrushes would you like?

Patrick: Can I have a look at them?

Clerk: Sure. This brand is supposed to be very good, but they're expensive. Those are new products. They come in several colors and sizes. There is also hard, soft, and medium.

Patrick: Are they cheaper?

Clerk: This one is 10 % off. That one has no reduction, but you can get a free tube of toothpaste with six toothbrushes.

Patrick: So if I buy a dozen, I'll get two free tubes of toothpaste?

Clerk: That's right.

Patrick: Good. I 'll take a dozen of them then.

Clerk: And here is your aspirin. What else did you say you want?

Patrick: Baby's wipes. Johnson's.

Clerk: Anything else?

Patrick: Well, actually I'd like to buy some vitamins for my son. He's five months old. Can you suggest any?

Clerk: Sure. Here you are. This one is excellent. Just mix one drop of it with milk.

Patrick: Thanks. That'll be all.