Penn Company uses a periodic inventory system. At the end of the annual accounting period, December 31, 2015, the accounting records provided the following information for product 1: Units Unit Cost 2,000 $6 Inventory, December 31, 2014 For the year 2015: Purchase, March 21 Purchase, August 1 Inventory, December 31, 2015 5,050 2,950 4,140 8 9 Required: Compute ending inventory and cost of goods sold under FIFO, LIFO, and average cost inventory costing methods. (Round "Average cost per unit" to 2 decimal places and final answers to nearest whole dollar amount.) FIFO LIFO Average Cost Ending inventory Cost of goods sold