PROBLEMS 1. Comparative income statements for 2010 and 2009 follow. 2010 2009 Sales $9,434,000 $7,862,000 Cost of Sales 7,075,400 5,660,640 Gross Profit $2,358,600 $2,201,360 Operating Expenses 1,367690 1,365,060 Operating Income $ 990,910 $ 836,300 Interest Expense 157.500 _126,000 Earnings Before Tax $ 833,410 $ 710,300 Income Taxes 400.000 __317,200 Net Income $ 433.410 $ 393.100 Required: a. Prepare a vertical common-size analysis of this statement for each year, using sales as the base. b. Comment briefly on the changes between the two years, based on the vertical common-size statement