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). Required: 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 $364 billion in 2018 and $362 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 $174 billion in 2018 and $170 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