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%. Percentage increase in net operating income 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: A | B | C 1 Chapter 5: Applying Excel 2 | 3 Data Unit sales 4 5 96,000 units 20 per Selling price per unit unit 7 Variable expenses per unit $ 12 per unit Fixed expenses 1,296,000 (a) What is net operating income? (Negative amount should be indicated by a minus sign.) Net operating income (loss) (b) By what percentage did the net operating income increase? Percentage increase in net operating income