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jay1180 · 2022年10月11日

这么做错哪里了~~

NO.PZ2018062003000206

问题如下:

Assume that the exchange rate between CAD and USD has decreased to 1.5800. If the USD has depreciated by 5% against the price currency, which of the initial exchange rate is the most accurate between CAD and USD?

选项:

A.

1.5048.

B.

1.6632.

C.

0.6646.

解释:

B is correct.

1.5800/initial rate = 1-0.05

initial rate=1.58/0.95 = 1.6632.

考点: Percentage Change in A Currency

解析:

1.5800/初始汇率= 1-0.05

初始汇率=1.58/0.95 = 1.6632.

现在CAD/USD=1.58,所以CAD=1.58USD.

USD贬值了,所以 0.95×原来的USD=USD

带入就要CAD=1.58USD=1.58* 0.95×原来的USD=1.501原来的USD


得到:CAD/原来的USD=1.501,选A。。。。

1 个答案

笛子_品职助教 · 2022年10月11日

嗨,爱思考的PZer你好:


这么做错哪里了~~


Hello,亲爱的同学!是乘除的方向错了。

正确的做法是:

1.5800/initial rate = 1-0.05

initial rate=1.58/0.95 = 1.6632.

所以呢,它并不是1.501


这里要有方程的数学思维了,纯想的话还是比较容易写错的了。

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