According to the Bureau of Economic Analysis (BEA), the level of external assets in the U.S. was $32.2 trillion at the end of 2020, and its external liabilities stood at $46.2 trillion. Suppose that the U.S. dollar is expected to appreciate by 8% against major currencies over the course of 2021. a) If, at the end of 2020, 90% of the external assets were denominated in foreign currencies and 10% in U.S. dollars, what will be the expected change in U.S. external assets (in $) resulting from the dollar appreciation in 2020 (i.e., the exchange-rate effect)? Show your calculations (with a positive number indicating an increase in external assets or a negative number representing a decrease). b) If, at the end of 2020, 5% of the external liabilities were denominated in foreign currencies and 95% in U.S. dollars, what will be the expected change in U.S. external liabilities (in $) resulting from the dollar appreciation in 2020 (i.e., the exchange-rate effect)? Show your calculations (with a positive number indicating an increase in external liabilities or a negative number representing a decrease). c) What will be the expected change in U.S. external wealth (in $) resulting from the dollar appreciation in 2020 (i.e., the exchange-rate effect)? Show your calculations (with a positive number indicating an increase in external wealth or a negative number representing a decrease).