Three People Check In Hotel

Three men check into a hotel. They pay $30 the hotel manager and go to their room.

The manager suddenly remembers that the room rate is $25 and gives $5 to the bellboy to return to the men.

On the way to the room the bellboy reasons that $5 would be difficult to share among three men so he pockets $2 and gives $1 to each man.

Now each men paid $10 and got back $1. So they paid $9 each, which costs them in total $27.

The bellboy has $2, totalling $29.

Where is the missing $1?