Figure this out (If you can...)

Once upon a time, three traveling salesmen were walking along a long stretch of road, trying (in vain) to peddle their wares. As the sun began to set, the weary salesmen began to look for a place to rest for the night, when they stumbled upon a hotel.

"How much for a room?" they asked the owner.

"Thirty dollars a night," he replied.

So the salesmen each handed the owner a ten and took the key.

A short time later, the owner had a change of heart. It looks like the salesmen are down on their luck. I'll give them $5 back.

Thinking this, he quickly called the bellhop, and gave him a five, instructing him to give it to the salesmen.

Well, the bellhop thought, They don't know they're getting a rebate. Besides, five dollars is hard to divide among three people. I'll just give them each a dollar, and keep two for myself. That way, everyone's happy, and I get a nice tip.

So that's what he did.

Now for the question:

Since the salesmen each ORIGINALLY paid $10 for the room, and each got back $1, their costs were $9 apiece.

3 x 9 = 27.

Add the $2 the bellhop kept, and you get $29.

What happened to the other dollar???