Missing, By Some Accounts

Three tourists rented a room for $30. The next morning, the manager realized that the room was only $25, so he sent his dishonest son to deliver the $5 difference. But the son only gave each of the three in the room $1, keeping $2 for himself.

This means that each tourist only paid $9 each for the room, rather than $10. But 3 times $9 is $27, and the dishonest son only kept $2, making only $29 all together, not $30. Where did the remaining dollar go?


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