Miller Company's contribution format income statement for the most recent month is shown below: Total Sales (25,800 units) Variable expenses $ 232,200 139,320 Contribution margin 92,880 Per Unit $ 9.00 5.40 $ 3.60 Fixed expenses 54,180 Net operating income $ 38,700 Required: (Consider each of the four requirements independently): 1. Assume the sales volume increases by 3,870 units: a. What is the revised net operating income? b. What is the percent increase in unit sales? c. Using the most recent month's degree of operating leverage, what is the percent increase in net operating income? 2. What is the revised net operating income if the selling price decreases by $1.30 per unit and the number of units sold increases by 16%? 3. What is the revised net operating income if the selling price increases by $1.30 per unit, fixed expenses increase by $8,000, and the number of units sold decreases by 5%? 4. What is the revised net operating income if the selling price per unit increases by 20%, variable expenses increase by 10 cents per unit, and the number of units sold decreases by 13%? 1a. Net operating income 1b. Percent increase in unit sales % 1c. Percent increase in net operating income % 2. Net operating income (loss) 3. Net operating income 4. Net operating income