One more thing that I think would be relevant to the-- there's also the annuity formula.

我认为还有一个与之有关的问题就是,还有一个年金公式

耶鲁公开课 - 金融市场课程节选

This is just the annuity formula, remember?

这就是年金公式,记得吗

耶鲁公开课 - 金融市场课程节选

What is the present value of an annuity?

那么年金的现值又是什么呢

耶鲁公开课 - 金融市场课程节选