(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 $900,000, a gross profit margin of 15 percent, and an inventory turnover ratio of 9 b. The firm has a cost of goods sold figure of $420,000 and an average age of inventory of 20 days c. The firm has a cost-of-goods-sold figure of $1,3 million and an inventory tumover rate of 8. d. The firm has a sales figure of $26 million, a gross profit margin of 14 percent, and an average age of inventory of 55 days