66-4A. Inventory Costing Methods-Periodic Method Arrow Company is a retailer that uses the periodic 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