seonjin na

Where does 10 dollars go??
SEONJIN NA (22.NOV.09)
Let’s assume a situation that happened in the hotel. Max, Mari, and I went to hotel to stay and paid 300 dollars for a day. Next day, one of the hotel managers knocked our room and talked about money that we paid last night. He was saying about they got wrong amount of money from us. It costs 250 dollars. So he gave us 50 dollars back. We divided each 10 dollars and gave to the manager 20 dollars for a tip. We calculated how much we did spend for hotel for making sure about it. However, ten dollars are gone. The reason why ten dollars are gone is because we calculated each 90 dollars and added 20 dollars that we gave the manager for a tip. So we calculated again. We added 250 dollars, 30 dollars and 20 dollars and got right amount of money that we spend.