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司晨 · 2021年02月10日

at the END of 13th years换句话说不就是14年年初么

NO.PZ2015120604000013

问题如下:

An annuity of $2,000 per year will be received for twenty years. The first payment is to be received at the end of thirteenth years. Assume the discount rate is 7% over next years, calculate the today's present value of the annuity

选项:

A.

$8,792.

B.

$9,408.

C.

$10,066.

解释:

B is correct.

  1. Calculate the PV of annuity at the end of the twentieth years : N = 20; I/Y = 7; PMT = -2,000; FV = 0; CPT PV = 21,188.03. ;
  2. Calculate the PV today: N = 12; PMT = 0; FV = -21,188.03; I/Y = 7; CPT PV = 9,407.74.

如果是14年年初理解,为什么N不是13呢?13就是对应0时点的意义不是么

2 个答案

星星_品职助教 · 2021年11月20日

@Alicia

同学你好,

时间轴上每个点都有两重含义。以13时点为例,同时代表14年初和13年末。

所以at the end of thirteenth year就直接画在13上。

----

或者用个更直接的例子,以0时点为例。这时候就是第一年的开始(第一年初),而到了1时点上,就是第一年已经结束了(第一年末),同时第二年开始了(第二年初)



星星_品职助教 · 2021年02月10日

同学你好,

①第13年末就是第14年初。描述的都是同一个点。由于时间轴上的每个点代表的都是“年末”,所以无论是13年末还是14年初都反应在时间轴的“13”时间点上。

只有14年末(at the end of 14th year)才会反应在14时间点上

②所以题干的描述就转化为:连续收20笔现金流,其中第一笔在13时间点上收。此时的折现就是要去折到12时间点上。所以接下来step 2中的“N”就是12而非13.

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

具体现金流入下图:

(如果这20笔现金流是在1,2....20时刻收到,那么求现值的折现是折到0时刻而非1时刻。同理,这20笔现金流是在13,14...32时刻收到,则求现值的折现是折到12时刻而非13时刻)

Alicia · 2021年11月20日

老师,我还是不太懂为什么第一笔现金流说的是at the end of thirteenth year为什么会画在13那个点上,不应该画在14那个点上吗?

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