I am needing assistance in the following question

Arrow Company is a retailer that uses the periodic inventory system. On August 1, it had 80 units of products A at a total cost of $1600. On August 5, Arrow purchased 100 units of A for $2116. On August 8, it purchased 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 31st 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.