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冬冬Liu~💫💫 · 2022年08月22日

为什么 n是5而不是4

NO.PZ2018062016000005

问题如下:

John receive a gift from his grandpa about $1.2 million. He plans to buy a house in five years later, which price is expected to be $250,000 at that time. How much should John deposit now if the stated annual rate is 3% and compounded monthly?

选项:

A.

$215,652

B.

$215,217

C.

$242,620

解释:

B is correct. Present value * (1+3%/12)12*5=$250,000, therefore, John should deposit $215,217 currently.

老师您好,为什么可以判断n是5而不是4啊?five years later 是说第五年年初还是年底呢

1 个答案

星星_品职助教 · 2022年08月22日

同学你好,

 five years later这种描述指得就是时间轴上的5时间点。

如果非要从年初或年末的角度去解释,就是第5年末。但不用这么去考虑问题,直接按N=5处理就可以了。

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