Assets Cash Accounts receivable (net) Inventory Property, plant, and equipment (net) Liabilities and Stockholders' Equity Accounts payable (trade) Income taxes payable (current) Long-term debt. Common stock Retained earnings Balance Sheet As of December 31, Year 4 $ 20,000 2 ? 310,000 $450,000 $ 2 20,000 7 316,000 7 $ ? Additional Information Current ratio (at year end) Total liabilities +Total stockholders' equity Gross margin percentage Inventory turnover (Cost of goods sold Ending inventory) Gross margin for Year 4 Required 1.4 to 1.0 60 30% 11.2 times $315,000 a. Compute the balance in trade accounts payable as of December 31, Year 4. b. Compute the balance in retained earnings as of December 31, Year 4. c. Compute the balance in the inventory account as of December 31, Year 4. (Assume that the level of inventory did not change from last year.) (For all requirements, negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Round your answers to the nearest whole dollar amount.) a. Accounts payable b. Retained earnings c. Inventory