Whirly Corporation's contribution format income statement for the most recent month is shown below: Sales (8,400 units) Variable expenses Contribution margin Total $ 294,000 159,600 134,400 Per Unit $ 35.00 19.00 $ 16.00 54,300 Fixed expenses Net operating income Required: (Consider each case independently): $ 80,100 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 7,400 units