The average price of a gallon of gas in 2021 dropped $0.12 (3 percent) from $3.61 in 2020 (to $3.49 in 2015). Required: 1. Prepare 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 Stafford Corp. for the year ended December 31, 2021 (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.) STAFFORD CORPORATION Income Statements (dollars in billions) For the Year Ended December 31 2020 2021 $ 220 Change in Dollars Percentage % Total Revenues $ 238 120 126 % 57 53 Costs of Crude Oil and Products Other Operating Costs Income before Income Tax Expense Income Tax Expense Net Income 43 59 % 22 19 24 $ $ 37 % 2-a. Conduct a vertical analysis by expressing each line as a percentage of total revenues. (Round percentage values to 1 decimal place.) 2020 $ STAFFORD CORPORATION Income Statements (dollars in billions) For the Year Ended December 31 2021 Total Revenues $ 220 % Costs of Crude Oil and Products 120 % Other Operating costs 57 % Income before Income Tax 43 % Expense Income Tax Expense 19 % Net Income $ 24 % % % 238 126 % 53 % 59 % 22 37 % % $ 2-b. Excluding income tax and other operating costs, did Stafford earn more profit per dollar of revenue in 2021 compared to 2021? Yes No