The average price of a gallon of gas in 2018 increased $0.30 (12.4 percent) from $2.42 in 2017 to $2.72 in 2018. Let's see whether these changes are reflected in the income statement of Tiger Industries for the year ended December 31, 2018 (amounts in billions). Revenues Costs of Purchased Crude Oil and Products Other Operating Costs Income before Income Tax Expense Income Tax Expense Net Income Required: 2018 $ 185 2017 $ 156 106 83 56 63 23 10 7 - $ 16 $ 10 1. Compute the gross profit percentage for each year. Assuming the change from 2017 to 2018 is the beginning of a sustained trend, is Tiger likely to earn more or less gross profit from each dollar of sales in 2019? 2. Compute the net profit margin for each year. Did Tiger do a better or worse job of controlling expenses other than the costs of crude oil and products in 2018 relative to 2017? 3. Tiger reported average net fixed assets of $348 billion in 2018 and $346 billion in 2017. Compute the fixed asset turnover ratios for both years. Did the company better utilize its investment in fixed assets to generate revenues in 2018 or 2017? 4. Tiger reported average stockholders' equity of $158 billion in 2018 and $154 billion in 2017. The company has not issued preferred stock. Compute the return on equity ratios for both years. Did the company generate greater returns for stockholders in 2018 or 2017?