A little puzzle.

Ok, three brothers are on a road trip. They decide to go to a motel for a night. They walk inside and the after a couple minutes of talking, the man at the register says that a room for 1 night is $30. So each brother hands him a $10 dollar bill, and the brothers go up to their room. Later on, the man at the register realizes that there is a sale, and the room was only $25. So the man at the register asks the bell-boy to take the 5 extra dollars up to the brother's room. The bell-boy realizes that it is really hard to split $5 even with three people so he pockets two for himself. The bell-boy gets to the room and hands each of the brothers a $1 bill.

Now, we can all agree that each person has paid $9 dollars for the room correct? Since they each got $1. But, 9 x 3 = 27. Add 27 with the 2 dollars that the bell-boy pockets and thats $29. Now, where the f*ck did the last dollar go?