Calculate the following ratios for Walmart and a competitor for two years. Present your calculations in a table. Profitability ratios: 1. Net Margin (Profit Margin) Ratio = Net Income - Net Sales 2. Gross Profit Ratio = Gross Profit = Net Sales 3. Asset Turnover Ratio = Net Sales - Average Total Assets 4. Return on Equity = Net Income = Average Total Stockholders' Equity