问题如下图:
选项:
A.
B.
C.
解释:
既然是连续复利,为什么用6%直接除以12,而不是用6%算出EAR再除以12?还有个问题是既然due是后付,那么先付该怎么说呢?
Olive_品职助教 · 2019年08月20日
同学你好,EAR=(1+6%/12)^12-1=6.1678%,以0.5%的利率按月复利,等价于以6.1678%的利率按年复利。如果用EAR计算,那么N要变成12,算出的PMT是每个月复利到年底的总额,这个总额不能简单除以12得到每月的月供,因为这个总额是复利后的年底金额,是有时间价值的,这个总额还要作为FV用计算器第三行再算一个PMT,N=12,I/Y=0.5%。这样分三步求出来的结果跟用N=60,I/Y=0.5%一步得到的结果是一样的。
这道题判断PMT时间点的关键词是“in one month”,也就是一个月之后付第一笔PMT,如果想表达先付,那么会直接说是annuity due,或者用beginning of the year/month这类的词汇,课后题关于年金时点描述的有些复杂,真实考试的时候会很明确的,一般不会有歧义。加油!
NO.PZ2017092702000016 问题如下 A sports car, purchasefor £200,000, is financefor five years annurate of 6% compounmonthly. If the first payment is e in one month, the monthly payment is closest to: A.£3,847. B.£3,867. C.£3,957. B is correct,“the first payment is e in one month”是第一笔付款在第一个月的意思(t=1),所以是个后付年金问题。后付年金模式下,PV=-200,000, N=12*5, I/Y=6/12,FV=0 CPT PMT=3866.56 为什么不需要先计算EAR(6.17%),然后再代入PV=-200000,N=5*12,I/Y=6.17/12,FV=0,求PMT?
NO.PZ2017092702000016 问题如下 A sports car, purchasefor £200,000, is financefor five years annurate of 6% compounmonthly. If the first payment is e in one month, the monthly payment is closest to: A.£3,847. B.£3,867. C.£3,957. B is correct,“the first payment is e in one month”是第一笔付款在第一个月的意思(t=1),所以是个后付年金问题。后付年金模式下,PV=-200,000, N=12*5, I/Y=6/12,FV=0 CPT PMT=3866.56 为什么让PV=0,FV=200000算出来的不对的呢
NO.PZ2017092702000016问题如下A sports car, purchasefor £200,000, is financefor five years annurate of 6% compounmonthly. If the first payment is e in one month, the monthly payment is closest to: A.£3,847. B.£3,867. C.£3,957. B is correct,“the first payment is e in one month”是第一笔付款在第一个月的意思(t=1),所以是个后付年金问题。后付年金模式下,PV=-200,000, N=12*5, I/Y=6/12,FV=0 CPT PMT=3866.56 如果是按照月度复利计息,为什么不是(年利率6%+1)开12次方根再减1,按照这个计算下来是0.486755%,,,而是直接用年利率6%除以12个月等于0.5%?不考虑按月复利计息吗?
NO.PZ2017092702000016问题如下A sports car, purchasefor £200,000, is financefor five years annurate of 6% compounmonthly. If the first payment is e in one month, the monthly payment is closest to: A.£3,847. B.£3,867. C.£3,957. B is correct,“the first payment is e in one month”是第一笔付款在第一个月的意思(t=1),所以是个后付年金问题。后付年金模式下,PV=-200,000, N=12*5, I/Y=6/12,FV=0 CPT PMT=3866.56 这个e是预先支付的意思,为什么不能理解为0时刻支付?
NO.PZ2017092702000016 £3,867. £3,957. B is correct, “the first payment is e in one month”是第一笔付款在第一个月的意思(t=1),所以是个后付年金问题。 后付年金模式下,PV=-200,000, N=12*5, I/Y=6/12,FV=0 CPT PMT=3866.56 如果是先付,题目一般会怎么描述?