If the exchange rate between the Japanese yen and the U.S. dollar expressed in terms of yen per dollar is ¥115 = $1, what is the exchange rate when expressed in terms of dollars per yen? Suppose that the current exchange rate between the dollar and the euro is €0.85 = $1. If the exchange rate changes to €0.90 = $1, has the euro appreciated or depreciated against the dollar? Briefly explain.