(Ratio analysis) Assuming a 360-day year, calculate what the average investment in inventory would be for a firm, given the following information in each case. a. The firm has sales of $400,000, a gross profit margin of 11 percent, and an inventory turnover ratio of 8. b. The firm has a cost-of-goods-sold figure of $460,000 and an average age of inventory of 30 days. c. The firm has a cost-of-goods-sold figure of $1.15 million and an inventory turnover rate of 5. d. The firm has a sales figure of $21 million, a gross profit margin of 15 percent, and an average age of inventory of 45 days