Case

Case 1

•I think you should tip 4 Australian dollar.

That is optional. Because the service staff is quite good ando the tip is not necessary as a complement to their salary.

I advice you that it is always good to be grateful for the service receiced.

Case 2

•I advice that it is not necessary, but it would be nice to help you for the good service. I could tip $4.000 dollar.