Impossible Math Problem

[Flint]

Three men check into a hotel room. The price is 30 dollars. They pay 10 dollars each and go to their room.

But wait, the clerk remembers that the weekday rate is 25 dollars--he overcharged them by 5 dollars! So, off he goes to refund the 5 dollars. But...he can't figure out how to divide 5 dollars evenly between the three people, so... he gives them back 1 dollar each, and pockets the other 2 dollars.

Now each man has paid 10 dollars, and has been refunded 1 dollar.

So, each man has paid 9 dollars. 9 times 3 = 27.

The clerk pocketed 2 dollars. 27 plus 2 = 29.

But...they originally paid 30 dollars.
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What happened to the other dollar?

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