Historical returns Calculate the arithmetic average return of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1985 to 1994. Which had the highest return? Which had the lowest return? On the left side, click on the Spreadsheet Learning Aid to see Table 8.1-Year-by-Year Returns, 1950-1999. What is the average retum of U.S. Treasury bills for 1985 to 1994? % (Round to two decimal places.) Historical returns Calculate the arithmetic average return of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1985 to 1994. Which had the highest return? Which had the lowest return? On the left side, click on the Spreadsheet Learning Aid to see Table 8.1-Year-by-Year Returns, 1950-1999. What is the average retum of U.S. Treasury bills for 1985 to 1994? % (Round to two decimal places.)