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jvniki · 2022年12月15日

什么时间需要求EAR 后再根据计算器算呢

NO.PZ2018062016000017

问题如下:

Bella set a new account for her worldwide-traveling plan. She plans to fund about $100,000 in five years and deposit cash in this account every month. Assume the stated annual rate is 3% and compounded monthly, the amount that Bella has to put into the account each month is:

选项:

A.

$1,547

B.

$1,570

C.

$1,670

解释:

A is correct. Input the following data in the calculator at END mode: N=5*12=60, I/Y=3/12, FV=100,000, PV=0, then PMT=-1,547. Therefore, the monthly deposit for Bella is $1547.

前面有道题 感觉类似,先求了EAR 本题也就求了EAR ,但是什么时间需要求,什么时间不需要求呢,因为看到了本题的compounding 计息频率是12

1 个答案
已采纳答案

星星_品职助教 · 2022年12月16日

同学你好,

原则是N、PMT、I/Y这三者必须一致。

本题问的是“the amount that Bella has to put into the account each month”,所以要计算的是每月的PMT,这种情况下就必须使用同为月度的利率,即期间利率3%/12,如果用了EAR就错了。

同样的道理,正因为要使用月度PMT,所以在I/Y选择月度数据的同时,N也必须转化为月份数,即不能直接使用N=5年,而是必须使用N=5×12=60月。

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相反,如果题目要求计算的是每年付多少钱,这时候就必须转化为EAR了,同时N只能等于5。

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对于有一些题目,使用期间利率和EAR都能得出答案,这时候首选用期间利率直接算,不用另外专门转化一次EAR。

往往这种题型都是PMT=0,已知PV计算FV,或已知FV计算PV的题目。



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