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于晴 · 2024年11月10日

不是说first payment occurring five years from today,应该用先付年金算呀,可以再讲一

An annuity makes seven annual payments of $10,000 each, with the first payment occurring five years from today. lf the discount rate is 6% per year, thevalue of theannuity today is closest to:


$41,715.

$44.218

$55,824


 B. Correct because the present value in Year 4of an ordinary annuity with 7 payments of $10,000 at a 6% discount rate is calculated as follows: PV=A[1-1/(1 + rN/rPV4= $10,000 x[1-1/(1 + 0.06)7]/0.06 PV4= $55,823.81 Then, using a timeline, the PV of the annuity in today's dollars is PVo = FV (1 + r)-N PVo = $55,823.81 x (1 + 0.06)-4PV,= $44,217.69 ≈ $44,218.

Calculator solution: (1)END mode; N = 7;1= 6; PMT = -10,000; FV = 0;solve for PV = 55,823.81.(2)END mode; N = 4;1= 6; PMT = 0; FV = -55,823.81; solve for PV =44,217.69. 

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品职助教_七七 · 2024年11月10日

嗨,从没放弃的小努力你好:


“the first payment occurring five years from today”说的是首笔付款在距离今天的五年后发生。这句话只告诉了首笔PMT发生的时间点,没有说是先付年金。这个条件相当于在说首笔PMT就发生在第五年,也就是发生在5时点。

如果题目没有强调该年金为先付,则就默认为是后付。正是因为这是后付年金,所以计算这个七年期年金时,现值要算到4时点。而不是5时点。

这是因为对于后付年金而言,首笔付款总要比现值晚一期。常规的后付年金首笔付款在1时点,现值在0时点。本题首笔付款在5时点,现值就应该算到4时点。

(如果现值算到5时点,首笔付款也在5时点,就真变成先付年金了,但题干没有给先付的条件,这样算就是错的。)


综上,本题就要用END模式来算七年期年金的现值:(1)END mode; N = 7; I/Y= 6; PMT = -10,000; FV = 0; CPT PV = 55,823.81.

得到 PV = 55,823.81后,再往前折现4期,就可以得到最终的现值。

(2)END mode; N = 4; I/Y= 6; PMT = 0; FV = -55,823.81; CPT PV =44,217.69. 


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