The accounting records of Swifty Corporation show the following data. Beginning inventory Purchases Sales 2,760 units at $7 7,810 units at $9 9.459 units at $12 Determine cost of goods sold during the period under a periodic inventory system using the FIFO method, the LIFO method, and the average-cost method. (For calculation purposes, round average cost to 3 decimal places, e.g. 5.275. Round answers to o decimal places, e.g. 125.) FIFO LIFO Average-cost Cost of goods sold