A、USD508.09. B、USD58.9. C、USD500.89. D、USD50089. C男士是想将美元换成人民币，他说他有“USD 500.89”，可见C为正确项。

W: Did you hear about Mr. William’s case last week?
M: Yes. It’s too terrible. As a matter of fact, he should not issue an open cheque in favor of a third party. Anyone who holds it would present it to the paying bank and obtain cash against it.
Q: What happened to Mr. Williams?

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?