Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,400 units) Total Per Unit $ 252,000 Variable expenses 151,200 $ 30.00 18.00 Contribution margin 100,800 $ 12.00 Fixed expenses 54,100 Net operating income $ 46,700 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 70 units? 2. What would be the revised net operating income per month if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 7,400 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income