Inventory Costing Methods and the Perpetual Method McKay & Company experienced the following events in March: Date Event Units Unit Cost Total Cost Mar. 1 Purchased inventory 100 @ $57 $5,700 Mar. 3 Sold inventory 60 Mar. 15 Purchased inventory 100 @ $60 $6,000 Mar. 20 Sold inventory 40 Assume the perpetual inventory system is used. Use the weighted-average inventory costing method to calculate the company's cost of goods sold and ending inventory as of March 31. 0 Round weighted average cost per unit to two decimal places. Use rounded answer for subsequent calculations. Round all other answers to the nearest dollar. March 3 Cost of goods sold $ March 20 Weighted average cost per unit $ 0 Cost of goods sold March 31 Total cost of goods sold $ 0 Ending inventory $ $ 0 0