ERROR the error mn cr uni LO2 E6-4A. Inventory Costing Methods-Periodic Method Arrow Company is a retailer that uses the pe- riodic inventory system. On August 1, it had 80 units of product A at a total cost of $1,600. On August 5, Arrow purchased 100 units of A for $2,116. On August 8, it purchased 200 units of A for $4,416. On August 11, it sold 170 units of A for $4,800. Calculate the August cost of goods sold and the ending inventory at August 31 using (a) first-in, first-out, (b) last-in, first-out, and (c) the weighted-average cost methods. Round your final answers to the nearest dollar