How much was the change for sending a registered airmail letter to London? [br]

W: Next please! Hello, may I help you, sir?
M: Yes, I want to send a registered airmail letter to London.
W: Ok, it comes to ＄4.35.
M: Here is five dollars.
W: Here is your change. Please wait for your receipt of the registered mail. And here is your receipt. Anything else?
M: Yes, four aerograms, twelve post cords, one roll of fifty 15-eent stamps and six airmail stamps.
W: That will be ＄20.50. Anything else?
M: I also want to pick up my package. This is the notice.
W: Please wait a minute. Here it is. We need your signature or I. D. on this note.
M: Ok. By the way, what is the size and weight limit for mailing a package?
W: It is ＄5...per kilo. The size is not more than 45 inches by 30 by 16. It also must be tied with string.
M: Can you write it down for me?
W: Of course.
M: Well, one more thing. Can I have this letter airmailed to London?
W: Yes, we send all the first class mail by plane to the East Coast, so you don’t need an airmail stamp.
M: I see! By the way, where can I mail this letter?
W: Drop it in the mail box marked "Out of Town" at that comer.
M: Thank you very much.
W: You ore welcome.