The Missing Dollar

Three friends go to a hotel and rent a room for $30. They each pay $10 and go to their room. The manager realizes that the room rate is actually $25 and gives $5 to the bellboy to return to the guests. The bellboy decides to keep $2 for himself and gives $1 to each of the friends. So, each friend paid $9 for the room, which is a total of $27. The bellboy has $2. Where is the missing dollar?

Solution: There is no missing dollar. The friends paid $27 in total, of which $25 went to the hotel and $2 went to the bellboy. The $30 is a red herring, as it is not the final amount paid by the friends.