Three guys go to a hotel. They tell the man behind the desk that they want 3 rooms. He says, “10 dollars per room so that''s 30 dollars.”So they pay and go up to their rooms.

Then, the deskman remembers that there is a special for 3 rooms for $25. He gives the bellhop the $5 change and tells him to take it up to them.
On the way, the bellhop realizes that he doesn''t know how to split it 3 ways so he keeps 2 and gives 1 to each man.

My question is: If after the dollar refund each man paid 9 dollars and $9 x 3 men equals $27 and the bellhop only has $2, then what happened to the other dollar?