未知题型 一架幻灯机的投影镜头f′=75㎜，当屏由8m移至10m时，镜头需移动多少距离？方向如何？

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未知题型 Suppose that the one-year interest rate is 12 percent in the United Kingdom. The expected annual rate of inflation for the coming year is 10 percent for the United Kingdom and 4 percent for Switzerland. The current spot exchange rate is ￡:SFr = 3. Using the precise form of the international parity relations, compute the one-year interest rate in Switzerland, the expected Swiss franc to pound exchange rate in one year, and the one-year forward exchange rate.