money

Three girls 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 girls back $5 because the hotel was having a special discount that weekend. So the three girls 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 girls 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?
Remember to send all answers to 

allgirlsmathtournament@gmail.com.

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