periodic inventory system merchandise inven LO2 P6-2A. Inventory Costing Methods-Periodic Method Tally Stores uses the periodic inventory for its merchandise inventory. The April 1 inventory for one of the items in the merchandise tory consisted of 120 units with a unit cost of $330. Transactions for this item during April follows: April 9 Purchased 40 units @ $345 per unit. 14 Sold 80 units @ $550 per unit. 23 Purchased 20 units @ $360 per unit. 29 Sold 40 units @ $550 per unit. Required a. Calculate the cost of goods sold and the ending inventory cost for the month of April using the weighted average cost method. Round the cost per unit to 3 decimal places and your final an- swers to the nearest dollar. b. Calculate the cost of goods sold and the ending inventory cost for the month of April using the first-in, first-out method. c. Calculate the cost of goods sold and the ending inventory cost for the month of April using the last-in, first-out method