NO.PZ2023071902000087
问题如下：
Question
A researcher compiles the following currency exchange data:
A/B C/B
Start of period 1.3578 110.24
Close of period 1.3286 109.52
For the duration, the closest percentage variation in the C/A cross-rate is:
选项：
A.–2.5%. B.1.5%. C.3.6%.解释：
Solution
The C/A exchange rate at the beginning of the period is calculated as = 1/1.3578 × 110.24 =81.19
The C/A rate at the end of the period is = 1/1.3286 × 109.52 = 82.43
The percentage change in the C/A exchange rate for the period is therefore = 82.42/81.19 - 1 ≈ 1.5% which is approximately 1.5%
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期初的C/A汇率计算为= 1/1.3578 × 110.24 =81.19
期末的C/A比率= 1/1.3286 × 109.52 = 82.43
因此，这一时期C/A汇率的变化百分比为= 82.42/81.19 - 1≈1.5%，约为1.5%
Start of period 1.3578 110.24
Close of period 1.3286 109.52这两组数据里面的110.24和109.52代表什么意思？为什么在计算的时候要乘上
