Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,000 units) Variable expenses Contribution margin Fixed expenses Total Per Unit $ 272,000 $ 34.00 152,000 120,000 54,700 19.00 $ 15.00 Net operating income $ 65,300 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 montini if the sales volume decreases by 70 units? 3. What would be the revised net operating income per month if the sales volume is 7.000 units?