So this chapter’s first task is to defineand explain net present value, rate of return, and opportunity cost of capital.

因此本章的第一个任务就是定义和解释净现值、回报率和资本的机会成本。

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For internal software projects, return is either calculated in terms of the 'Net Present Value' of the project, or in terms of an internal rate of return.

对内部软件项目来说，收益或是以项目的‘净现值’计算，或是以内部收益率计算。

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In the case of the internal rate of return calculation, a net present value of zero is assumed, and the internal rate of return needed to produce this is computed.

在对内部收益率的计算中，净现值被设为零，要计算的是使净现值为零的内部收益率。

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