On August 28, 2015, the exchange rate of U.S. dollar per Australian dollar was 0.7234. It is now September 28, 2018. A U.S.-made big screen TV costs $3,500 over the entire period. Has the U.S. dollar appreciated or depreciated in value relative to the Australian dollar? Is it cheaper or more costly for an Australian citizen to buy the TV (converting Australian dollars into U.S. dollars) on September 28, 2018? What is the Australian citizens A$ gain or loss on the purchase of the TV if she waits to buy on September 28?