Find the most recent 10-Ks for Intel, Exxon-Mobile, and Apple. Calculate each firm's profit margin, asset turnover, and return on assets. How profitable have these firms been over the last three years? Calculate the fixed asset tangibility for each firm as the ratio of property, plant, & equipment to total assets. Which firm uses the most/least operating leverage? Why? Calculate the total debt ratio, debt-to-equity ratio, and the equity multiplier for each firm. Which firm uses the most/least financial leverage? Briefly explain how the use of operating and financial leverage are different/similar for these firms and how their use of leverage affects each firm's profitability