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Missing Buck

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Every engineer needs to take a brief break every now and then.  OK puzzle
solvers!  Lets see who can figure this one out first:

Three guys go to a hotel, and get a room for $10 a piece, or a total of $30.
They go up to their room, when the clerk realizes the room was only $25, not
$30. So he gives $5 to the bellhop, and tells him to go rectify the matter.
The bellhop then goes upstairs, and gives $1 to each guy, so they have now
each paid $9 for the room, instead of $10. The Bellhop keeps $2 as a tip.
Okay, you have 3 guys who each paid $9, for a total of $27, and $2 for the
bellhop, which makes $29. 

Where did the extra dollar go?