Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,900 units) Total Variable expenses $ 302,600 169,100 Contribution margin Fixed expenses 133,500 55,200 $ 78,300 Per Unit $ 34.00 19.00 $ 15.00 Net operating income Required (if you're having trouble figuring out how to approach this problem, see below for a hint): (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 7,900 units? 1. Revised net operating income 2. Revised net operating income 3. Revised net operating income