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Air MailFender had to send a lot of papers by air mail to a friend in another country. He put them all in a big envelope and took it to the post-office." How much is this? " he asked." You'll have to pay a lot for this," said the man in the post-office. " It's very heavy. Must it go by air mail? "" Yes, it must. How much is it, please? "" Wait a minute, please," said the man. " I'll find out."He soon came back. " You must pay two pounds, sir," he said.Fender gave him two one-pound notes." I have no one-pound stamps," said the man. " But I have some stamps of small value. I can give you a lot of those."" It doesn't matter," said Fender.The man gave him a lot of stamps, and Fender put them on the envelope one after the other. The envelope was soon covered with stamps, but the value of all the stamps together was two pounds." May I post it now? " asked Fender." No, sir. Wait a minute please. You've put a lot of stamps on the envelope, and it's much heavier now. You'll have to pay more."" How much more? " asked Fender." Please wait a minute. I'll find out. . . ."4