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 1 Chapter 5: Applying Excel 2 3 Data B C 4 Unit sales 36,000 units 5 Selling price per unit $ 40 per unit 6 7 Variable expenses per unit Fixed expenses $ 24 per unit $ 240,000 (a) What is net operating income? (Negative amount should be indicated by a minus sign.) Net operating income (loss)