Due to a recession in Germany, interest rates are low and are expected to remain low. However, since American economy is booming, interest rates are expected to rise in the United States. A rise in interest rates would lead to a rise of the dollar in comparison to the mark. Analysts at Charles$$s investment bank expect the dollar to remain at the current exchange rate of DM $1\mathrm{.}50$ per dollar for the fifth year and then to rise to DM $1\mathrm{.}80$ per dollar by the end of the seventh year. Therefore, Charles is considering investing at the beginning of the sixth year in a two$-$year American municipal bond paying $3\mathrm{.}6$ percent tax$-$exempt interest to help pay tuition. How much money should he plan to convert into dollars by selling B bonds for this investment?