Calculate the following exchange rates (ZAR and USD refer to the South African rand and U.S. dollar, respectively): a. The current ZAR spot rate in USD that would have been forecast by PPP. (Do not round intermediate calculations. Round your answer to 4 decimal places.) b. Using the IFE, the expected ZAR spot rate in USD one year from now. (Do not round intermedlate calculations. Round your answer to 4 decimal places.) c. Using PPP, the expected ZAR spot rate in USD four years from now. (Do not round intermediate calculations. Round your answe to 4 decimal places.)