Compute or identify the following profitability ratios of Facebook Inc. for its years ending December 31, 2019 and December 31, 2018. Interpret its profitability using the results obtained for these two years. 1. Profit margin ratio. 2. Gross profit ratio. 3. Return on total assets (Only find the ratio for 2019). 4. Return on common stockholders' equity (Only find the ratio 2019). 5. Basic net income per common share.