Suppose that a Big Mac costs $5.00 in New York and SF30 in Geneva. Suppose further that the price of 1SF on that day is $0.20. Calculate the purchasing power parity exchange rate between the Swiss franc and the dollar. Based on your calculation, is the SF overvalued or undervalued? Explain. Suppose now that a Big Mac costs 1.25 pounds in London while the spot rate exchange rate is $2.50. Is the pound overvalued or undervalued? Explain. Is the Big Mac a good basis for PPP calculations? Why or why not?