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Challenge 81


Surprise at the restaurant

Difficulty level:

Three friends went to eat in a restaurant and in the end the bill gave $ 30.00. They did the following: each gave $ 10.00. The waiter took the money to the cashier and the restaurant owner said the following:
- "These three are old customers of the restaurant, so I will return $ 5 for them… "
And handed the waiter five coins of $ 1.00. The clever waiter did the following: he took $ 2 for him and gave $ 1 for each of his friends. In the end each of the friends paid the following:
$ 10.00 - $ 1.00 that was returned = $ 9.00.
So if each of us spent $ 9, what the three of us spent together was $ 27. And if the waiter took him $ 2.00, we have:
Us: R $ 27,00
Waiter: $ 2.00
TOTAL: R $ 29.00
Question: where did the other $ 1.00 go ???