THE RIDDLE OF THE MISSING DOLLAR - Whatever jokes

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THE RIDDLE OF THE MISSING DOLLAR
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?