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Using a Contribution Format Income Statement Porter Company's most recent income statement is shown below: Prepare a new income statement under each of the following conditions (consider each case independently): 1. The sales volume increases by 15%. 2. The selling price decreases by 50 cents per unit, and the sales volume increases by 20%. 3. The selling price increases by 50 cents per unit, fixed expenses increase by $10,000, and the sales volume decreases by 5%. 4. Variable expenses increase by 20 cents per unit, the selling price increases by 12%, and the sales volume decreases by 10%