purchase power parity and interest rate parity

Sir, I am having trouble with the following example. Please Correct me where I'm mistaken! [Example] The $100m is received from US Customer. The current Foreign Exchange rate is $/£ 1.543. The Local Inflation rate is 4% and Foreign Inflation rate is 3%. [Answer] Purchase Power Parity formula is used: S1 = $1.543 x (1.03 / 1.04) = $1.528 [If we convert $100m Cashflow today for Cash in one year's time, we will result in £65.45 round off] If there is an increase in Inflation rate of £ to 5% S1 = $1.543 x (1.03 / 1.05) = $1.513 [$1.513 as compared to $1.528 is less which means if we convert $100m Cashflow it will result in £66.10m round off in one year's time - which means we are getting more money] If there is a decrease in Inflation rate of £ to 2% S1 = $1.543 x (1.03 / 1.02) = $1.558 [$1.558 as compared to $1.528 is more which means if we convert $100m Cashflow it will result in £64.19m round off in one year's time - which means we are getting less money] If exchange rate is lower that mean we are getting more? [Correct?] Same goes with the Interest Rate Parity.