Whirly Corporations most recent income statement is shown below: Total Per Unit Sales (10,000 units) $ 350,000 $ 35.00 Variable expenses 200,000 20.00 Contribution margin 150,000 $ 15.00 Fixed expenses 135,000 Net operating income $ 15,000 Required: Prepare a new contribution format income statement under each of the following conditions (consider each case independently): 1. The sales volume increases by 100 units. 2. The sales volume decreases by 100 units. 3. The sales volume is 9,000 units.