Three guys rent a hotel room for the night. when they get to the hotel they pay the $$\$30 $$ fee, then go up to their room. soon the bellhop brings up their bags and gives the lawyers back $5 because the hotel was having a special discount that weekend. so the three lawyers decide to each keep one of the $5 dollars and to give the bellhop a $2 tip. however, when they sat down to tally up their expenses for the weekend the could not explain the following details:

each one of them had originally paid $10 (towards the initial $30), then each got back $1 which meant that they each paid $9. then they gave the bellhop a $2 tip. however, 3 • $9 + $2 = $29

the guys couldn't figure out what happened to the other dollar. after all, the three paid out $30 but could only account for $29.

can you determine what happened?