How much will the woman pay for these tickets?

M: Tickets for the museum are 10 dollars for an adult and half the price for a child.
W: All right. I’d like two tickets for adults and two for children.

W: I’ve sent an e-mail to make a reservation for a double room four days ago.
M: Let me see. I’m sorry, sir. Your conformation of your request is too late. We’re full up since there’s an important conference.