Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,600 units) Variable expenses 19.00 Total $266,600 163,400 Per Unit $31.00 Contribution margin 103,200 $ 12.00 Fixed expenses 54,800 Net operating income $ 48,400 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 50 units? 2. What would be the revised net operating income per month if the sales volume decreases by 50 units? 3. What would be the revised net operating income per month if the sales volume is 7,600 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income