2. Change all of the numbers in the data area of your worksheet so that it looks like this: 1 Chapter 5: Applying Excel 3 Data 4 Unit sales 5 Selling price per unit 6 Vanable expenses per unit 10 per unit 6 per unit Fixed expenses S 210,000 If your formulas are correct, you should get the correct answers to the following questions. (a) What is the break-even in dollar sales? Break-even in dollar sales (b) What is the margin of safety percentage? Margin of safety rcentage (c) What is the degree of operating leverage? (Round your answer to 2 decimal places. Degree of operating 3. Using the degree of operating leverage and without changing anything in your worksheet, calculate the percentage change in net operating income if unit sales increase by 20%. ercentage increase in net operating