NO.PZ2018062003000205
问题如下：
The exchange rate between the Canadian dollar (CAD) and US dollar (USD) is 1.3245(CAD/USD=1.3245). Assume that the Canadian dollar (CAD) has appreciated 15 percent against US dollar (USD) during the past month. How much has the US dollar depreciated against the Canadian dollar?
选项：
A.15%
B.More than 15%
C.Less than 15%
解释：
C is correct.
考点：Percentage Change in A Currency
解析：A货币对B货币的升值幅度不等于B货币对A货币的贬值幅度。
在本题中，[1/(1 + 0.15)] – 1 = (1/1.15) – 1 = -0.1304, or -13.04%.
题目做对是因为还记得结论是升值是大于贬值的。这道题，我知道CAD升值了15%，就是 (1+15%) USD / CAD，也就是 1/1.15 CAD / USD，但是最后那一步我就不太懂了
