Porter Company's most recent contribution format income statement is shown below: Total Per Unit Sales (30,000 units) $150,000 $5 Variable expenses 90,000 3 Contribution margin 60,000 $2 Fixed expenses 50,000 Net operating income.. $ 10,000 Required: Prepare a new contribution format income statement under each of the following conditions (con- sider each case independently): 1. The number of units sold increases by 15%. 2. 3. The selling price decreases by 50 cents per unit, and the number of units sold increases by 20%. The selling price increases by 50 cents per unit, fixed expenses increase by $10,000, and the number of units sold decreases by 5%. 4. Variable expenses increase by 20 cents per unit, the selling price increases by 12%, and the number of units sold decreases by 10%.