Score: 0 of 1 pt 3 of 9 (4 complete) HW Score: 40.74%, 3.67 of 9 pts P8-9 (similar to) Question Help o Historical returns. Calculate the arithmetic average return of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1989 to 1998. 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 return of U.S. Treasury bills for 1989 to 1998? % (Round to two decimal places.) Score: 0 of 1 pt 3 of 9 (4 complete) HW Score: 40.74%, 3.67 of 9 pts P8-9 (similar to) Question Help o Historical returns. Calculate the arithmetic average return of U.S. Treasury bills, long-term government bonds, and large-company stocks for 1989 to 1998. 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 return of U.S. Treasury bills for 1989 to 1998? % (Round to two decimal places.)