How much is a large bottle of aspirin?

M: I’d like a bottle of aspirin, please.
W: A large one or a small one?
M: A large one, please.
W: That’s eighty-seven pence.
M: And a tube of toothpaste. A large one.
W: That’s fifty-six pence.
M: Oh, yes. And a film for this camera.
W: That’s one pound seventy-two.
M, Right. Here you are. Five pounds. Thank you very much.
W: Don’t forget your change, sir.