Income statements for Stuart Company for Year 3 and Year 4 follow: STUART COMPANY Income Statements Year 4 Year 3 Sales $201,100 $181,100 Cost of goods sold 142,800 120,800 Selling expenses 21,800 19,800 Administrative expenses 12,700 14,700 Interest expense 3,900 5,900 Total expenses $181,200 $161,200 Income before taxes Income taxes expense Net income 19,900 6,200 $13,700 19,900 3,900 $ 16,000 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.