Need Help with Part 3. Please an explanation

E7-6 Analyzing and Interpreting the Financial Statement Effects of Periodic FIFO, LIFO, and Weighted Average Cost [LO 7-3] Orion Iron Corp. tracks the number of units purchased and sold throughout each year but applies its inventory costing method at the end of the year, as if it uses a periodic inventory system. Assume its accounting records provided the following information at the end of the annual accounting period December 31 Unit Units Cost 350 $14 a. Inventory, Beginning For the year: b. Purchase, April 11 c. Purchase, June 1 d. Sale, May 1 (sold for $42 per unit) e. Sale, July 3 (sold for $42 per unit) f. Operating expenses (excluding income tax expense), $19,600 950 700 16 350 670 12 Required 1. Calculate the number and cost of goods available for sale 2,000 units S27,500 Number of Goods Available for Sale Cost of Goods Available for Sale 2. Calculate the number of units in ending inventory ding Inventory 980 units 3. Compute the cost of ending inventory and cost of goods sold under (a) FIFO, (b) LIFO, and (c) weighted average cost. (Do not round intermediate calculations. Round your final answers to the nearest dollar amount.) Cost of Ending Inventory Cost of Goods Sold FIFO LIFO Weighted Average Cost 14,560 $ 12,940