Miller Companys contribution format income statement for the most recent month is shown below: Total Per Unit Sales (40,000 units) $ 320,000 $ 8.00 Variable expenses 200,000 5.00 Contribution margin 120,000 $ 3.00 Fixed expenses 42,000 Net operating income $ 78,000 Required: (Consider each case independently): 1. What is the revised net operating income if unit sales increase by 15%? 2. What is the revised net operating income if the selling price decreases by $1.10 per unit and the number of units sold increases by 24%? 3. What is the revised net operating income if the selling price increases by $1.10 per unit, fixed expenses increase by $7,000, and the number of units sold decreases by 8%? 4. What is the revised net operating income if the selling price per unit increases by 20%, variable expenses increase by 30 cents per unit, and the number of units sold decreases by 9%?