Assume that on September 1, Office Depot had an inventory that included a variety of calculators. The company uses a perpetual inventory system. During September, these transactions occurred. Sept. 6 Purchased calculators from Sheridan Co. at a total cost of $1,518, on account, terms n/30. 9 Paid freight of $46 on calculators purchased from Sheridan Co. 10 Returned calculators to Sheridan Co. for $59 credit because they did not meet specifications. 12 Sold calculators costing $476 for $636 to Sunland Book Store, on account, terms n/30. 14 Granted credit of $42 to Sunland Book Store for the return of one calculator that was not ordered. The calculator cost $33. 20 Sold calculators costing $522 for $698 to Carla Vista Card Shop, on account, terms n/30. Prepare a tabular summary to record the transactions for the month of September for Office Depot using a perpetual inventory system. Include margin explanations for the changes in revenues and expenses. - Decreases in assets, liabilities, or stockholders' equity require a negative sign or parentheses. - Increases in expenses require a negative sign or parentheses. - Reductions in revenues require a negative sign or parentheses