2. Ratio Calculation Under the “Investors” link at DuPont’s website (dupont.com), you will find financial statements for the company. Using the most recent Form 10-K, calculate the following ratios for DuPont over the three years reported: gross margin, operating margin, return on assets, return on equity, book value per share, earnings per share, cash flow per share, price-book, price earnings, and price-cash flow. How have these ratios changed over this period?