为何用Annuity due来算这道题而不是ordinary annuity？问题如下图：
选项：
A. 
B. 
C. 
解释：
菲菲_品职助教 · 2018年10月31日
同学你好，这道题目从题目的第二句话就可以看出来是先付年金哦，题目说“The first payment of the annuity is to be received today”，意思就是第一笔年金的payment会在今天收到，那也就意味着是先付。先付年金的题目还有另外一种说法，比如说“The payment of the annuity is to be received at the beginning of the each year”，类似于这种，也代表着先付年金。但具体还是要具体题目具体分析，最好的方法是画一个时间轴，其实货币时间价值的题目很多画时间轴就可以很清晰的解决啦。
加油~
阿然斯基 · 2018年11月01日
Received today, today 可以是年末呀～～～
doris · 2019年11月27日
这个解释还是挺牵强的 今天收到 今天也可能是年末 所以题目有漏洞
NO.PZ2015120604000011 问题如下 investor purchaseannuity many years ago. The first payment of the annuity is to receivetoy. Assume the payment of the annuity is $5,000 constanly , the periothe payment is 20 years. anthe scount rate is 12%, calculate the toy' value of the annuity: A.$37,347. B.$403,493. C.$41,829. C is correct.Unr the BGN mo.N = 20; PMT = -5,000; I/Y =12; FV = 0; CPT PV = 41,828.89. 这道题从哪里判断的是先付年金呀
NO.PZ2015120604000011 问题如下 investor purchaseannuity many years ago. The first payment of the annuity is to receivetoy. Assume the payment of the annuity is $5,000 constanly , the periothe payment is 20 years. anthe scount rate is 12%, calculate the toy' value of the annuity: A.$37,347. B.$403,493. C.$41,829. C is correct.Unr the BGN mo.N = 20; PMT = -5,000; I/Y =12; FV = 0; CPT PV = 41,828.89. 可以用后付年金的计算方式，用n=19来算么
NO.PZ2015120604000011问题如下 investor purchaseannuity many years ago. The first payment of the annuity is to receivetoy. Assume the payment of the annuity is $5,000 constanly , the periothe payment is 20 years. anthe scount rate is 12%, calculate the toy' value of the annuity: A.$37,347.B.$403,493.C.$41,829.C is correct.Unr the BGN mo.N = 20; PMT = -5,000; I/Y =12; FV = 0; CPT PV = 41,828.89.我最近错的题目全部都是先付后付判断不对导致的 要不就是时间折现点的N算的不对，有容易理解的方法吗
NO.PZ2015120604000011 问题如下 investor purchaseannuity many years ago. The first payment of the annuity is to receivetoy. Assume the payment of the annuity is $5,000 constanly , the periothe payment is 20 years. anthe scount rate is 12%, calculate the toy' value of the annuity: A.$37,347. B.$403,493. C.$41,829. C is correct.Unr the BGN mo.N = 20; PMT = -5,000; I/Y =12; FV = 0; CPT PV = 41,828.89. crecivetoy 意思不是于今天收到吗，不是今天存入呀，意思是多年前买的年金今天可以提取了，不应该是求fv嘛
NO.PZ2015120604000011 问题如下 investor purchaseannuity many years ago. The first payment of the annuity is to receivetoy. Assume the payment of the annuity is $5,000 constanly , the periothe payment is 20 years. anthe scount rate is 12%, calculate the toy' value of the annuity: A.$37,347. B.$403,493. C.$41,829. C is correct.Unr the BGN mo.N = 20; PMT = -5,000; I/Y =12; FV = 0; CPT PV = 41,828.89. 这道题pmt是-5000，我一直搞不清楚什么时候是用+什么时候-
