Well that's pretty easy to do.

好吧，这很简单吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

Revenues minus costs makes profits, and again, for those of you who are less familiar with economics, I'm hoping this is not really too hard but you can read up on it.

收入减去成本就是利润,对经济学不太了解的同学,我觉得这个很简单,你们都能听懂吧

耶鲁公开课 - 博弈论课程节选