问题如下图：请老师看下我的思路哪里错了？
第一年 4000*1.02的平方=4161·6
第二年（4161·6+8000）*1·02的平方=12652·93
依此类推，最后算出选C
选项：
A. 
B. 
C. 
解释：
NO.PZ2017092702000010 问题如下 A saver posits the following amounts in account paying a stateannurate of 4%, compounsemiannually:the enof Ye4, the value of the account is closest to: A.$30,432 B.$30,447 C.$31,677 B is correct.To solve for the future value of unequcash flows, compute the future value of eapayment of Ye4 the semiannurate of 2%, anthen sum the invifuture values, follows:根据上表所示，首先计算每笔存款的FV，但是需使用semiannurate 2%，然后将FV相加求和。 为什么不是按照effective annurate的计算方式计算呢？这样一年4%，按照半年机洗一次的话，EAR应该算出来是4.04%呀，并不是直接4%除上2，这个理解是哪里有问题呢？
NO.PZ2017092702000010 问题如下 A saver posits the following amounts in account paying a stateannurate of 4%, compounsemiannually:the enof Ye4, the value of the account is closest to: A.$30,432 B.$30,447 C.$31,677 B is correct.To solve for the future value of unequcash flows, compute the future value of eapayment of Ye4 the semiannurate of 2%, anthen sum the invifuture values, follows:根据上表所示，首先计算每笔存款的FV，但是需使用semiannurate 2%，然后将FV相加求和。 若用CF计算，CF0 = 0，CF1，3，5，7=0，2，4，6，8分别为题目给予的数值，同时I = 2，这样计算是否正确
NO.PZ2017092702000010 问题如下 A saver posits the following amounts in account paying a stateannurate of 4%, compounsemiannually:the enof Ye4, the value of the account is closest to: A.$30,432 B.$30,447 C.$31,677 B is correct.To solve for the future value of unequcash flows, compute the future value of eapayment of Ye4 the semiannurate of 2%, anthen sum the invifuture values, follows:根据上表所示，首先计算每笔存款的FV，但是需使用semiannurate 2%，然后将FV相加求和。 ti
NO.PZ2017092702000010 问题如下 A saver posits the following amounts in account paying a stateannurate of 4%, compounsemiannually:the enof Ye4, the value of the account is closest to: A.$30,432 B.$30,447 C.$31,677 B is correct.To solve for the future value of unequcash flows, compute the future value of eapayment of Ye4 the semiannurate of 2%, anthen sum the invifuture values, follows:根据上表所示，首先计算每笔存款的FV，但是需使用semiannurate 2%，然后将FV相加求和。 题干里给的是每年年末的posit。第一年4000，第二年8000，第二年8000里面不会有4000已经compoun第四年年末了吗？再计算8000的compoun什么没有重复计算的问题？
NO.PZ2017092702000010问题如下 A saver posits the following amounts in account paying a stateannurate of 4%, compounsemiannually:the enof Ye4, the value of the account is closest to:A.$30,432B.$30,447C.$31,677 B is correct.To solve for the future value of unequcash flows, compute the future value of eapayment of Ye4 the semiannurate of 2%, anthen sum the invifuture values, follows:根据上表所示，首先计算每笔存款的FV，但是需使用semiannurate 2%，然后将FV相加求和。 我的想法每一年分开算，如第一年，N=2，I/Y=2%，pv=题目中的，然后能算出来FV第二年，N和I/Y不变，PV=第一年算出来的值，PMT=题目给的第二年的投资，算FV第三年，N和I/Y不变，PV=第二年算出来的值，PMT=题目给的第三年的投资，算Fv这个FV就是答案。请问老师我这个思路有什么问题吗？
