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叶赫那拉坤坤 · 2021年02月27日

能先算出EARM?

  1. CFA I
  2. Quantitative

NO.PZ2017092702000019

问题如下：

A client invests €20,000 in a four-year certificate of deposit (CD) that annually pays interest of 3.5%. The annual CD interest payments are automatically reinvested in a separate savings account at a stated annual interest rate of 2% compounded monthly. At maturity, the value of the combined asset is closest to:

选项：

A.

€21,670.

B.

€22,890.

C.

€22,950.

解释：

B is correct,

as the following cash flows show:

The four annual interest payments are based on the CD’s 3.5% annual rate. The first payment grows at 2.0% compounded monthly for three years (where FV is future value): FVN = €700(1 +0.02/12 )3×12 FVN = 743.25 The second payment grows at 2.0% compounded monthly for two years: FVN = €700(1 +0.02/2 )2×12 FVN = 728.54 The third payment grows at 2.0% compounded monthly for one year: FVN = €700(1 +0.02/12 )1×12 FVN=714.13

The fourth payment is paid at the end of Year 4. Its future value is €700. The sum of all future value payments is as follows:

（1+2/12）^4*12=EAR+1 算出EAR

然后用

700*（1+EAR）^3

700*(1+EAR)^2

700*(1+EAR)^1

700

这四笔现金流求和

这样做怎么不对呀？

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1 个答案
已采纳答案

星星_品职助教 · 2021年02月27日

同学你好，

这么做的思路是对的。

EAR的计算有问题，首先EAR是代入百分号进行计算的。其次EAR是每“年”利率的概念，如果在再用4年×12次方，求出来的就是4年利率而不是每年利率了。

所以EAR修改为：（1+2%/12）^12=EAR+1，得到EAR=2.0184%。此后按照你的思路逐笔计算FV后加和，再加上最初的20,000就可以了。

-------------------------

这道题相当于等额的现金流（700）连续投4年，所以可以直接用计算器第三排五个键的年金功能来更加便捷的计算。

①首先按照年金的方式来计算利息再投资的终值：N=4，I/Y=2.0184，PV=0，PMT=700，CPT FV=-2885.9208；其中700是20,000每年按照3.5%产生的利息，I/Y是转化的EAR，因为利息（PMT）的频率也是一年一付的。

②然后把期初的这20,000再加回去，得到22,885.92。

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NO.PZ2017092702000019问题如下A client invests €20,000 in a four-yecertificate of posit (C thannually pays interest of 3.5%. The annuinterest payments are automatically reinvestein a separate savings account a stateannuinterest rate of 2% compounmonthly. maturity, the value of the combineasset is closest to:A.€21,670.B.€22,890.C.€22,950. B is correct, the following cash flows show:The four annuinterest payments are baseon the Cs 3.5% annurate. The first payment grows 2.0% compounmonthly for three years (where FV is future value): FVN = €700(1 +0.02/12 )3×12 FVN = 743.25 The seconpayment grows 2.0% compounmonthly for two years: FVN = €700(1 +0.02/12 )2×12 FVN = 728.54 The thirpayment grows 2.0% compounmonthly for one year: FVN = €700(1 +0.02/12 )1×12 FVN=714.13The fourth payment is paithe enof Ye4. Its future value is €700. The sum of all future value payments is follows:根据EAR的公式（1+2%/12）^12=1+EAR，得到EAR=2.0184%。然后1. 首先按照年金的方式来计算利息再投资的终值N=4，I/Y=2.0184，PV=0，PMT=700，CPT FV=-2885.9208；其中700是20,000每年按照3.5%产生的利息，I/Y是转化的EAR，因为利息（PMT）的频率也是一年一付的。2. 然后把期初的这20,000再加回去，得到22,885.92。（和B有写出入是因为四舍五入的问题，但不影响选出答案） 老师，2/12这个不是把月计的利率转成年计吗，和E的区别在哪？谢谢

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