问题如下：
Over the past month, the Swiss Franc (CHF) has depreciated 12 percent against pound sterling (GBP). How much has the pound sterling appreciated against the Swiss Franc?
选项：
A.12%
B.Less than 12%
C.More than 12%
解释：
C is correct.
The appreciation of sterling against the Swiss franc is simply the inverse of the 12% depreciation of the Swiss franc against Sterling: [1/(1 – 0.12)] – 1 = (1/0.88) – 1 = 0.1364, or 13.64%.
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 – 0.12)] – 1 = (1/0.88) – 1 = 0.1364, or 13.64%.
“the Swiss Franc (CHF) has depreciated 12 percent against pound sterling (GBP)”是不是指比如本来表示成X CHF/GBP的X下降了百分之12？（R18第二课）
