我们该给司机小费吗？

It depends on what you feel like, maybe a dollar for each bag.

嗯，要视情况而定，或许每件行李要给1美元吧!

This is one hundred Yuan and you can keep the change.

这是 100元，你不用找了。

Here is the fare and this is for you.

这是车费，这是给你的小费。