Please solve step by step all the sections that need to be answered in the question.

(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 $600,000, a gross profit margin of 13 percent, and an inventory turnover ratio of 4. b. The firm has a cost-of-goods-sold figure of $400,000 and an average age of inventory of 40 days. c. The firm has a cost-of-goods-sold figure of $1.15 million and an inventory turnover rate of 7. d. The firm has a sales figure of S21 million, a gross profit margin of 20 percent, and an average age of inventory of 45 days. a. The firm has sales of $600,000, a gross profit margin of 13 percent, and an inventory turnover ratio of 4, what is the firm's average investment in inventory? (Round to the nearest dollar.)