Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,100 units) Variable expenses Contribution margin Fixed expenses Total $ 259,200 153,900 105,300 56,000 Net operating income $ 49,300 Per Unit $ 32.00 19.00 $13.00 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 90 units? 2. What would be the revised net operating income per month if the sales volume decreases by 90 units? 3. What would be the revised net operating income per month if the sales volume is 7,100 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income