The average price of a gallon of gas in 2010 jumped $0.43 (18 percent) from $2.36 in 2009 (to $2.79 in 2010). Lets see whether these changes are reflected in the income statement of Chevron Corporation for the year ended December 31, 2010 (amounts in billions).

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

Total Revenues Costs of Crude Oil and Products Other Operating Costs 2010 2009 $205 $172 116 100 53 57 Income before Income Tax Expense3219 Income Tax Expense 13 Net Income $19 $ 11