6-8A. Inventory Costing Methods-Periodic Method The following data are for the Porter Corporation, which sells just one product: Units Unit Cost Beginning inventory, January 1 Purchases February 11 May 18 October 23 Sales March 1. July 1 October 29 1,200 1,500 1,400 1,100 1,400 1,400 1,200 $ 8 9 12 14 Calculate the value of ending inventory and cost of goods sold at year-end using the periodic method and (a) first-in, first-out, (b) last-in, first-out, and (c) weighted-average cost method. Round the cost per unit to 3 decimal places and round your final answers to the nearest dollar. If the net realizable value of the inventory at year-end is $15, how will the cost of goods sold under each method be affected