Three long time best friends decide to take a road trip. They decide to stop and get a hotel room for the night. Agreeing it would be cheaper, they decided to split the cost of one room. The man at the desk tells them it will be $30 for the night so they each chip in $10 but when the man at the desk finishes putting in the information in the computer the room was rated at $25 for the night so he gave them back $5 in change. The three friends decide to each take $1 and give the man the remaining $2.
Question:
If each of the three guys paid $10 and got $1 back that means they each paid $9 for a total of $27, add in the $2 that they gave the man and it comes to a total of $29. What happened to the extra dollar?