Let's make a bargain shall we?

我们做个约定好吗？

But I did not pit you, is to let you make a bargain.

但我并没有坑你，是让你赚了大便宜。

The prison chaplain came to me in my cell and tried to make a bargain with me.

监狱牧师来到我的囚室，试图和我达成一项协议。

Let's make a bargain, you do the homework for me and I will give you the book.

让我们做笔交易吧，你帮我做作业，我就把书给你。