3. Suppose that the treasurer of IBM has an extra cash reserve of $100,000,000 to invest for six months. The six-month interest rate is 9 percent per annum in the United States and 5 percent per annum in Germany. Currently, the spot exchange rate is 1.30 per dollar. the expected future exchange rate after six months is 0.7 per dollar, and the six-month forward exchange rate is 1.80 per dollar. The treasurer of IBM may bear an exchange risk to maximize his/her return. What is the best investment strategy for the treasurer to maximize the return? Use equations to explain your