Assume the average price of a litre of gas in 2017 jumped $0.17 (16 percent) from $1.04 in 2016 to $1.21 in 2017 . Let's see whether this change is reflected in the income statement of Suncor Energy inc. for the year ended December 31, 2017 (amounts in billions). Required: 1-a. Conduct a horizontal analysis by calculating the year-over-year changes in each line item, expressed in dollars and in percentages. (Enter amounts in billions of dollars. Round your percentages to 1 decimal place.) 1-b. Not avallable in Connect. 2-a. Conduct a vertical analysis by expressing each line as a percentage of total revenues. (Round your answers to 1 decimal places.) 2.b. Excluding income tax and other operating costs, did Suncor earn more profit per dollar of revenue in 2017 compared to 2016