Sine the interest rate differential is 6% in favour of sterling then the spot rate needs to be 6% below the new expected future spot rate of £0.60/£1. Hence, the spot rate needs to jump depreciate from £0.50/$1 to £0.566/$1 (£0.60/$1 divided by 1.06). At this spot exchange rate £100 can be converted into $176.67 which will earn the 4% US interest rate, which by the end of the year will become $183.75 ($176.67 * 1.04) and which the investor expects to convert at £0.60/$1, yielding £110.24 ($183.75 * £0.60/$1). The expected return is hence equalized as required by the UIP condition. The important point about this exercise is that a perceived worsening of the expected sterling parity in one year's time from £0.53/$1 to £0.60/$1 leads to a deprecation of the sterling spot rate. Changes in expectations about the future exchange rate are potentially powerful forces in determining the spot exchange rate.