Show me step-by-step how to do it, especially for the average cost!

E7.5 (Algo) Calculating Ending Inventory and Cost of Goods Sold Under FIFO, LIFO, and Average Cost LO7.2 Nittony Compony uses o periodic inventory system. At the end of the annual accounting period, December 31 of the current year, the occounting records provided the following information for product 1: Compute ending inventory and cost of goods sold for the current year under FIFO, LIFO, and average cost inventory costing methods. Note: Round "Average cost per unit" to 2 decimal places and final answers to nearest whole dollor amount