Inventory Costing Methods Spangler Company is a retailer that uses the periodic inventory systems. On March 1, it had 100 unies of product M at a total cost of $9,540. On March & Spangler purchased 200 unves of M for $21,000. On March 10, it purchased 150 units of M for $18000, On March 15 it sold 180 units of M for $32,400 Calculate the March cost of goods sold and the ending inventory at March 31 using (al first-on first-out, (b) last in first-out, and (c) the weighted-average cost method. Round your final answers to the nearest dollar UFO Weghd average Cost of goods sold Ending inventory