9. Checking inventory availabinty 14.4 Download the spreadsheet from the course website and perform the following tasks REQUIRED a. Create a formula in column F to calculate how many days a particular invoice has been outstanding. b. Create a formula in column G that attaches the correct label to each invoice (e.g., if the invoice is 0-30 days old, the label should be "0-30"; if it is 31-60 days old, the label should be "31-60", etc.) according to the table in the upper right corner of the spreadsheet. c. Create a pivot table that shows the sum, count, and average values for each of the four categories of accounts receivable. d. Create a pivot table that shows total amounts and count of invoices by both category (e.g., 0-30, 31-60, etc.) and region (East, West, North, South). e. Modify the pivot table in step d to be able to filter the results by salesperson. 14.5 Create a questionnaire checklist that can be used to evaluate controls for each of the