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GS · 2020年01月31日

问一道题:NO.PZ2017092702000016

问题如下:

A sports car, purchased for £200,000, is financed for five years at an annual rate of 6% compounded monthly. If the first payment is due in one month, the monthly payment is closest to:

选项:

A.

£3,847.

B.

£3,867.

C.

£3,957.

解释:

B is correct,

calculated as follows (where A is annuity and PV is present value):

A=[11(1+rs/m)mNrs/m]A=\left[\frac{1-\frac1{(1+r_s/m)^{mN}}}{r_s/m}\right]

l=(200,000)[11(1+0.06/12)12×50.06/12]      {l}=(200,000)\left[\frac{1-{\displaystyle\frac1{(1+0.06/12)^{12\times5}}}}{0.06/12}\right]\\\;\;\;

l=(200,000)/51.72556      {l}=(200,000)/51.72556\\\;\;\;

=3,866.56=3,866.56

请问可以帮忙解释答案中公式的具体理论吗?谢谢

fw · 2020年10月20日

l代表什么?

2 个答案

星星_品职助教 · 2020年10月20日

@fw

同学你好,上面回复已经说过了,我们并不使用这个公式来计算,所以不需要考虑公式的内容和参数,忽略即可。

星星_品职助教 · 2020年02月03日

同学你好,

这个公式的本质就是一期一期的先折现,然后求和。然后通过数学给归纳了一个比较简洁的形式,其实也就是计算器第三排5个键的背后逻辑。

但是我们是不用这个公式来代数计算的,考试也不会对这个公式有记忆的要求,都是用计算器来直接计算的。

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