My bad on the caps. I always forget something. 
And no you’re not missing a dollar. I mean yeah, you are if you add $2/$5 taken away. Which makes no sense.
They originally paid $30. Each guy got $1 dollar back. So now we have that $27 the three guys paid. Now the bellboy took $2. Now we have the $25 dollars the room really cost.
There is $5 left over. $3 went to the guys, and $2 went to the bellboy. :gotme: