Calculation Riddle

Hi guys, do you like to have some riddles? I guess this should be my first post on giving riddle. Most of the females like to guess riddle, I don't know why. Some will say they are not good at it, but yet they interested to know. Why? I bet ya it's related to curiosity.

All right, now I have a calculation riddle for you to guess. It should not be that difficult, if you think about it logically.

Riddle is dead? Oh My.

"3 chicks went for a dinner and it cost them $30 per person. So each of them paid $10 to the cashier. However, the cashier realized they calculated wrongly, and the 3 chicks should have paid RM25 only. So the cashier handed over $5 to a waitress and asking her to refund the 3 chicks. Out of greed, the waitress secretly took $2 out of the $5, and she managed to return $3 to the 3 chicks later. Having returned $3, each chick took back $1. So, in total, each chick paid $9 only."

Okay, here's the equation:
1. Each chick paid $9. So $9 x 3 = $27
2. The waitress took $2.
3. So, $27 + $2 = $29

Eh, where did the remaining $1 go?

I will post the answer in the comment after 3 days from now.
Good luck!