听力原文：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. How much was the change for sending a registered airmail letter to London?