The+Riddle+of+the+Hotel+Bill

I heard this riddle, and it really has bothered me. I am sure that most people could see quite clearly the simple answer. Three people check into a hotel, they are going to share the room. The clerk charges them $30, and so each of the people put a 10 dollar bill on the counter. The clerk hands them the key, and the people go up to the room. Later on, the manager arrives at the clerks desk an tells the clerk about the special prices for the rooms and instead of $30 per room, the cost is only $25 per room. He hands the clerk $5 and tells the clerk to go up to the three peoples room and give them the $5. On the way to the room, the clerk decides that it will be much easier to give the three people $3, splitting the $5 between the three would be rather complicated. So he puts $2 in his pocket. After he hands each of the three people $1, that brings the total spent by each of the three people to $9 each. Now, since the three people have spent $9 each, making the total $27, and the $2 the clerk put in his pocket brings the grand total of $29. But we originally started with 3 ten dollar bills.
 * The Riddle of the Hotel Bill**
 * How could you explain to someone else how this can happen?

media type="file" key="Adam and Sam.m4a" media type="file" key="Alex,Donghwan,James.m4a" media type="file" key="Alex,Lloyd,Kelvin.m4a" media type="file" key="DavidJackyJefferysolution.m4a" media type="file" key="Erica,Amy,Josephine.m4a" media type="file" key="jasmine, lily, shelly, janna, stephanie, naomi.m4a" media type="file" key="jenny amber yasmin.m4a" media type="file" key="Toby and Zach.m4a" media type="file" key="victor,aAlan, keniel, patrick and william.m4a"**