NO.PZ2016010802000206
问题如下：
An exchange rate between two currencies has increased to 1.4500. If the base currency has appreciated by 8% against the price currency, the initial exchange rate between the two currencies was closest to:
选项：
A.1.3340.
B.1.3426.
C.1.5660.
解释：
B is correct.
The percentage appreciation of the base currency can be calculated by dividing the appreciated exchange rate by the initial exchange rate. In this case, the unknown is the initial exchange rate. The initial exchange is the value of X that satisfies the formula:
1.4500/X = 1.08
Solving for X leads to 1.45/1.08 = 1.3426.
考点： Percentage Change in A Currency
解析:
1.4500/初始汇率= 1.08.
初始汇率= 1.45/1.08 = 1.3426
一开始的汇率 a/b0
b appreciate --> 1.08b0
所以1.45 = a/(b0*1.08)
求一开始的汇率比应该是1.45*1.08么？
