2. Change all of the numbers in the data area of your worksheet so that it looks like this: (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 operating income if unit sales increase by 20% 4. Confirm your calculations in Requirement 3 above by increasing the unit sales in your worksheet by 20% so that the Data area looks like this. (b) By what percentage did the net operating income increase