Suppose the nominal exchange rate was 15 yen per mark, Japan produced silk for 2 yen. Germany produced water for 6 marks. What is the real exchange rate? If the price in Germany rises to 8 marks, what must be the nominal exchange rate become if real exchange rate remains unchanged? 45 silk/wter, 11.25 yen/mark 45 silk/water, 60 yen/mark 5 silk/water, 6.66 yen/mark 25 silk/water, 60 yen/mark