The average price of a gallon of gas in 2013 dropped $0.12 (3 percent) from $3.61 in 2012 (to $3.49 in 2013). Lets see whether these changes are reflected in the income statement of Chevron Corporation for the year ended December 31, 2013 (amounts in billions).

	2013			2012
Total Revenues	$	285		$	301
Costs of Crude Oil and Products		120			124
Other Operating Costs		59			55
Income before Income Tax Expense		106			122
Income Tax Expense		21			28
Net Income	$	85		$	94

1-a. Compute the gross profit percentage for each year. (Round your answers to 1 decimal place.)

2-a. Compute the net profit margin for each year. (Round your percentage answers to 1 decimal place.)

3-a. Chevron reported average net fixed assets of $230 billion in 2013 and $162 billion in 2012. Compute the fixed asset turnover ratios for both years. (Round your answers to 2 decimal places.)

4-a. Chevron reported average stockholders equity of $220 billion in 2013 and $162 billion in 2012. Compute the return on equity ratios for both years. (Round your percentage answers to 1 decimal place.)