Assume the current spot rate between the UK and the U.S. is .6402 per $1. The expected inflation rate in the U.S. is 1.9 percent. The expected inflation rate in the UK is 2.1 percent. If relative purchasing power parity exists, what will the exchange rate be two years from now?

.6417/$1

.6382/$1

.6404/$1

.6453/$1

.6549/$1

I keep getting .6427