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 Insignia Corporation for the year ended December 31, 2018 (amounts in billions). 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 Insignia earn more gross profit per dollar of revenue in 2018 compared to 2017? 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.)