Exercise 02 In chronological order, the inventory, purchase, and sale of a single product for a recent month are as tollows: Units 300 800 400 1,000 700 500 1,200 600 400 S/unit $10 $11 $20 $12 $20 $22 $13 $22 $22 June 01 Beginning inventory 04 Purchase 08 Sale 12 Purchase 16 Sale 20 Sale 24 Purchase 28 Sale 29 Sale Required: I- Using the periodic inventory system, compute the cost of ending inventory, cost of goods sold, and ross profit (gross margin). Use the weight-average cost, FIFO and LIFO inventory methods. 2- Using the perpetual inventory system, compute the cost of ending inventory, cost of goods sold, an ross profit (gross margin). Use the weight-average cost, FIFO and LIFO inventory methods