A、40 cents. B、30 cents. C、50 cents. D、20 cents. CHow much is the change?

W: Excuse me, sir. Can you tell me how much it costs to send an airmail letter to Paris?
M: That’s one dollar if it is not overweight.
W: How about postcards?
M: That will cost you 80 cents.
W: Well, will you first weigh this letter for me?
M: OK. The letter is 10 grams overweight, Madam. You’ll have to pay 20 cents extra for the overweight.
W: Here you are. And I want to buy a 30 cent stamp.
M: Well. One 30 and 20 cents extra, that will be $1.50 altogether.
W: Here’s $2.
M: OK. Here’s your change. Have a nice day!
W: Thank you!