any help would be greatly appreciated cannot figure this out!

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 . Required: 1. Conduct a horizontal analysis by calculating the year-over-year changes in each line item, expressed in dollars and in percentages for the income statement of Chevron Corporation for the year ended December 31, 2018 (amounts in bilions). 2-a. Conduct a vertical analysis by expressing each line as a percentage of total revenues. 2.b. Excluding income tax and other operating costs, did Chevron eatn more gross profit per dollor of revenue in 2018 compared to 2017? Complete this question by entering your answers in the tabs below. Conduct a horizontal andysis by calculating the year-over-year changes in each line item, expressed in dollars and in percentages for the income statement of Chevron Corporation for the year ended December 31,2018 (amounts in billions). (Decreases should be indicated by a minus sign. Enter your answers in billions (1.e, 10,000,000,000 should be entered as 10). Round percentage values to 1 decimal place.) Complete this question by entering your answers in the tabs below. Conduct a horizontal analysis by calculating the year-over-year changes in each line item, expressed in dollars and in percentages for the income statement of Chevron Corporation for the year ended December 31,2018 (amounts in billions). (Decreases should be indicated by a minus sign. Enter your answers in billions (i.e., 10,000,000,000 should be entered as 10 ). Round percentage values to 1 decimal place.) Complete this question by entering your answers in the tabs below. Conduct a vertical analysis by expressing each line as a percentage of total revenues. (Round percentage values to 1 decimal place.)