Suppose the real exchange rate is 1 litre of Canadian gasoline per 2 litres of U.S. gasoline, 1 litre of U.S. gasoline costs $0.50 U.S., and a litre of Canadian gas costs $1.30 Canadian. What is the nominal exchange rate? Select one: O 0.5 U.S. dollars per Canadian dollar O 1.30 U.S. dollars per Canadian dollar O 0.77 U.S. dollars per Canadian dollar O 0.38 U.S. dollars per Canadian dollar O 0.65 U.S. dollars per Canadian dollar