Periodic and Perpetual Systems and Inventory Costing Methods E7A. During July 2014, Micanopy, Inc., sold 500 units of its product Empire for $8,000 The following units were available: Cost $ 2 Beginning inventory Purchase 1 Purchase 2 Purchase 3 Purchase 4 Units 200 80 120 300 180 6 9 12 A sale of 500 units was made after purchase 3. Of the units sold, 200 came from begin ning inventory and 300 came from purchase 3. Determine cost of goods available for sale and ending inventory in units. Then determine the costs that should be assigned to cost of goods sold and ending inventory under each of the following assumptions. (For each alternative, show the gross margin. Round unit costs to cents and totals to dollars.) 1. Costs are assigned under the periodic inventory system using (a) the specific iden- tification method, (b) the average-cost method, (c) the FIFO method, and (d) the LIFO method. 2. Costs are assigned under the perpetual inventory system using (a) the average-cost method, (b) the FIFO method, and (c) the LIFO method