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question 6 The following table shows the flow of inventory in chronological order. October 1 4 12 16 24 31 Instructions Beginning Inventory Purchase Purchase Sale Purchase Ending Inventory Units 150 400 800 1,300 400 450 $/unit 20 30 32 42 * Selling price (1) Assume the company follows a perpetual system. Using FIFO method, compute the cost of goods sold, the value of ending inventory and gross margin. (2) Assume the company follows a perpetual system. Using the average-cost method, compute the cost of goods sold, the value of ending inventory and gross margi.