6. The second part of the lawman: sheet contains a sales assoc1ate lookup form, but the appropriate formulas have not been entered yet. 21. In cell BIS, enter a formula to calculate the average commission earned for the sales associate last name entered in cell A16. (Him? Use a database function. Use the named range Earnings as the Dafabme argument and the column label Commission Earned as the Field argument. The criteria range should be A15:1316.) In cell B19, enter a formula to calculate the total commission earned for that same sales associate. (Hint Use a different database function. The function arguments are the same as those you used in Step 6a.) If necessary, apply the Accounting Number Format to cells BIS:B19