2. Change all of the numbers in the data area of your worksheet so that it lonks like this: If your formulas are correct, you should get the correct answers to the folowing questions. (a) What is the break-ewen in dollar sales? (b) What is the margin of safety percentage? (c) What is the degree of operating leverage? (Round your answer to 2 decimal places.) 3. Using the degree of operating leverage and without changing anything in your worksheet, calculate the percentage change in net aperating income if unit sales increase by 20%