No3 号板块 CFA答疑解惑 annuity, received, payments, discount, present

bchadwick

两个简单的年金问题What is the PV of an annuity that pays $200 per year at the end of each of the next 13 years,given a 6％ discount rate?

易知 N=13 ,I/Y=6，PMT=200，FV=0,CPT→PV=...
可是教材上答案是1770.54.而我反复算的答案是1734
好吧，这个当做教材错误吧
可是接下来一题
What is the present value of four $100 end-of-year payments if the first payment is to be received three years from today and the appropriate rate of return is 9％。。。。
因素就不一一列举了，教材答案是272.68
而我算出来的答案是263.12
求战友们指导一下到底是哪儿出了问题
第一题我的公式如下：PV=200(1-0.06)+200(1-0.06)2+....+200（1-0.06）的十三次方
第二题也差不多，就不列举了
在线求指点，都纠结两天了

Analti_Calte

第一题是这样的，求PV ,已知年金pays 200 per year at the end of each of next 13years,give a 6％discount rate