In chronological order, the inventory, purchases, and sales of a single product for a recent month are as follows:

Using the periodic inventory system, compute the cost of ending inventory, cost of goods sold, and gross margin. Use the average-cost, FIFO, and LIFO inventory costing methods. Explain the differences in gross margin produced by the three methods. Round unit costs to cents and totals to dollars.
Effects of Inventory Costing Methods on Cash Flows

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Amount Units per Unit June Beginning inventory 150 $30 4 Purchase 400 12 Purchase 800 16 Sales 1,300 24 Purchase 300 woww 33 36 60 39