Riddles and Puzzles

Riddles and Puzzles # 34

Three friends check into a motel for the night and the clerk tells them the bill
is $30, payable in advance. So, they each pay the clerk $10 and go to their room.
A few minutes later, the clerk realizes he has made an error and overcharged the
trio by $5. He asks the bellhop to return $5 to the 3 friends who had just checked
in. The bellhop sees this as an opportunity to make $2 as he reasons that the three
friends would have a tough time dividing $5 evenly among them; so he decides to tell
them that the clerk made a mistake of only $3, giving a dollar back to each of the
friends. He pockets the leftover $2 and goes home for the day! Now, each of the
three friends gets a dollar back, thus they each paid $9 for the room which is a
total of $27 for the night. We know the bellhop pocketed $2 and adding that to the
$27, you get $29, not $30 which was originally spent.

Where did the other dollar go????