At the post office. Sending a letter

Dialogue

Postal clerk:		— Yes, ma´am?
Mrs Ryefield:		— How much is a stamp to send a letter to France, please?
Postal clerk:		— Air mail or surface mail?
Mrs Ryefield:		— Air mail, please.
Postal clerk:		— That´ll be eighty-five cents.
Mrs Ryefield:		— Four stamps, please. How much is that?
Postal clerk:		— Three dollars and forty cents.
Mrs Ryefield:		— There you go.