EEA 关于PV 和FV 的取值

NO.PZ2018101501000023 问题如下 Company M is evaluating two mutually exclusive projects with requirerate of return of 12%.Whiprojeshoulcompany M choose? A.ProjeA because its NPV is higher. B.ProjeA because its Eis higher. C.ProjeB because its Eis higher. C is correct.考点Mutually Exclusive Projects with fferent Lives解析在选择不同期限的互斥项目时，我们可以使用EAA法。先计算出每一个项目的NPV，再根据算出的NPV来计算PMT，从而挑选一个能给我们带来等效年金最大的项目。NPVA = -130,000 +∑t=1350,0001.12t+50,000+30,0001.124\sum_{t=1}^3\frac{50,000}{1.12^t}+\frac{50,000+30,000}{1.12^4}∑t=13​1.12t50,000​+1.12450,000+30,000​ = $40,933.01 PV = -40,933 , N=4 , I/Y=12 , FV=0 CPT→PMTA = 13,476.56 NPVB = -85,000 + ∑t=1245,5001.12t\sum_{t=1}^2\frac{45,500}{1.12^t}∑t=12​1.12t45,500​ +45,500+20,5001.123\frac{45,500+20,500}{1.12^3}1.12345,500+20,500​ = $38,874.82 PV = -38,874.82 , N=3 , I/Y=12 , FV=0 CPT→PMTB = 16,185.49 因为项目B的EAA较大，所以我们应该选择项目 老师，我脑子老是混淆mutuexclusive project和expansion project，因为咱们讲expansion project的时候，最后一期现金流是=OCF+TNOCF=OCF+WC+St-T*(St-Bt），这里是怎么理解after-tsalvage就是最后一期的TNOCF呢？

NO.PZ2018101501000023 如题，两种都算了算，答案倒是可以选对。

NO.PZ2018101501000023 ProjeA because its Eis higher. ProjeB because its Eis higher. C is correct. 考点Mutually Exclusive Projects with fferent Lives 解析在选择不同期限的互斥项目时，我们可以使用EAA法。先计算出每一个项目的NPV，再根据算出的NPV来计算PMT，从而挑选一个能给我们带来等效年金最大的项目。NPVA = -130,000 + ∑t=1350,0001.12t+50,000+30,0001.124\sum_{t=1}^3\frac{50,000}{1.12^t}+\frac{50,000+30,000}{1.12^4}∑t=13​1.12t50,000​+1.12450,000+30,000​  = $40,933.01       PV = -40,933 , N=4 , I/Y=12 , FV=0  CPT→PMTA = 13,476.56       NPVB = -85,000 + ∑t=1245,5001.12t\sum_{t=1}^2\frac{45,500}{1.12^t}∑t=12​1.12t45,500​ + 45,500+20,5001.123\frac{45,500+20,500}{1.12^3}1.12345,500+20,500​  = $38,874.82       PV = -38,874.82 , N=3 , I/Y=12 , FV=0  CPT→PMTB = 16,185.49       因为项目B的EAA较大，所以我们应该选择项目B。不明白为什么不是直接安算出来的npv威正带入pv算

NO.PZ2018101501000023 只是说我们的单纯的求NPV而已， 和expansion proje里面的公式是咩有关系的对吗？