Three men go to a restaurant. They order some food. After they have finished, they ask for the bill. The bill was **30$** . They pay the bill and leave the restaurant.

As soon as they leave, the manager find out that there was a miscalculation and that they actually had to pay **25$** . 

He calls the waiter, give him the extra  **5\$**, and ask him to pass this money back to men. The waiter leaves the restaurant with **5\$** , but he pot 2% in his pocket and give each man **1$**.

So

Each man payed  $  10\$-1\$ = 9\$ $. 
<br>Three man payed $ 9\$*3=27\$ $.
<br>The waiter has $ 2\$ $
<br>The total is $ 27\$ + 2\$ = 29\$ $

Where is the last  $ 1\$ $?