Miller Company's contribution format income statement for the most recent month is shown below: Sales (25,800 units) Total $ Per Unit $ 9.00 232,200 Variable expenses 139,320 5.40 Contribution margin 92,880 $ 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 4,644 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 23%? 3. What is the revised net operating income if the selling price increases by $1.30 per unit, fixed expenses increase by $9,000, 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 10%, variable expenses increase by 20 cents per unit, and the number of units sold decreases by 12%? 1a. Net operating income 1b. Percent increase in unit sales 1c. Percent increase in net operating income $ 55,418 % % 2. Net operating income (loss) 3. Net operating income 4. Net operating income