Hotel of the Missing Dollar

Three men decided to share a hotel room. The room costs $30 so each man pays $10. The manager later realizes that he over charged the men. The room was only suppose to cost $25, so he gives the bellboy $5 to return to the men. The bellboy brings the $5 to the men. The men can't split $5 three ways so they each take $1 and give the bellboy a $2 tip. So then each man really paid $9 ($10-$1=$9) and the bellboy got a $2 tip. That adds to $29 ($9+$9+$9+$2=$29). What happened to the extra dollar?