听力原文：M: Good afternoon, Madam. I want to exchange some US dollars for RMB Yuan. I've got USD 500.89.

W: All right. This is an exchange memo. Please fill in your name and the amount you intend to change.

Q: How much US dollars does the man want to exchange?

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   Write a bank letter according to the following requirements.

  美国纽约的ABC银行在你行(DEF银行)开设了人民币账户。过去的账户余额按5%计年息，从2008年10月1日期将按5.5%计算，透支额按6%计。

  请按标准格式，代表你行会计部主任向对方发一公函，告知上述变动，并提醒对方：在你行开设的人民币账户一般不可透支，要求对方无论何时都要保有贷方余额，出现透支时，随即予以补上。

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