這麽聰明的人，我又要給你“B”了。公司一點都不傻。再看看我的原算，因為，。。。

a dollar in the future is not as valuable as a dollar today. 

so the company is using the current dollars that the pensioner are NOT taking out to generate dollars for the future, and they need to generate less current dollars to ballance the same number for the future.

That is why it is necessary to estimate the total CURRENT NET VALUE  as descripted in my original culcalation.