The accounting records of Teal Mountain Electronics show the following data. Beginning inventory 2,000 units at $6 Purchases Sales 8,000 units at $7 9,000 units at $10 (a) Determine cost of goods sold during the period under a periodic inventory system using the FIFO method. (b) FIFO Cost of goods sold during the period $ Save for Later Attempts: 0 of 1 used Submit Answer Determine cost of goods sold during the period under a periodic inventory system using the LIFO method. LIFO Cost of goods sold during the period $ Save for Later Attempts: 0 of 1 used Submit Answer (c) Determine cost of goods sold during the period under a periodic inventory system using the average-cost method. (Round average-cost per unit to 3 decimal places, e.g. 12.502 and final answer to O decimal places, e.g. 1.250.) Cost of goods sold during the period $ Average-cost