4. The income statement of Wilcox, Inc. includes the items listed below: Net sales $900,000 Gross profit $360,000 Beginning inventory 880,000 Purchase discounts 15,000 Purchase returns and allowances 8,000 Freight-in 10,000 Operating expenses 300,000 Purchases 590,000 Instructions Use the appropriate items listed above as a basis for determine the amount: (a) Cost of goods sold. (b) Cost of goods available for sale. (c) Ending inventory