Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (7, 300 units) Total Variable expenses $ 219,000 146,000 Contribution margin 73,000 Per Unit $ 30.00 20.00 $ 10.00 Fixed expenses 55, 900 Net operating income $ 17, 100 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 6,300 units?