Income statements for Zachary Company for Year 3 and Year 4 follow: Required a. Perform a horizontal analysis, showing the percentage change in each income statement component between Year 3 and Year 4. b. Perform a vertical analysis, showing each income statement component as a percentage of sales for each year. Complete this question by entering your answers in the tabs below. Perform a horizontal analysis, showing the percentage change in each income statement component between Year 3 and Year 4. (Negative answers should be indicated by a minus sign. Round your percentage answers to 1 decimal place. (i.e., 0.234 should be entered as 23.4).)