Thanks again.: I was not able to stump you!...….so I and two of my friends went hunting last week and grabbed a hotel for a night and the manager told us the room cost $30. We each handed him a $10 bill and went to the room.. Apparently the hotel manager realized he made a mistake and that the room was only$25...So he gave his son, five $1 bills and told him to come knock on our door and give us the change. When he knocked on the door and handed me the five $1 bills, I kept one and gave each of my friends $1 and told the kid to keep the remaining $2 for a tip. Thus, each of us spent $9 ( the original $10 less the $1 we got back). $9 time 3 is $27...The kid has $2 for a tip, which totals $29 ($27+$2). Where did the other $1 go ?