Whirly Corporation's contribution format income statement for the most Sales (8,500 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 289,000 153,000 Per Unit $ 34.00 -18.00 136,000 $ 16.00 55,700 $ 80,300 Pequir 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 7,500 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income