9. (***) (Microsoft Excel problem) Note that Problems 6 through 8 all could be solved by a single spreadsheet that allows the user to change the planning, “Forecasted Sales,” and “Actual Workers” values. Create this spreadsheet.

Your spreadsheet should calculate new results any time the planning, “Forecasted Sales,” or “Actual Workers” values change. Verify that your spreadsheet works by determining whether or not it generates the same costs for a level production plan and a chase production plan shown in Problems 6 and 7.