Whirly Corporations contribution format income statement for the most recent month is shown below: Total Per Unit Sales (7,000 units) $ 224,000 $ 32.00 Variable expenses 126,000 18.00 Contribution margin 98,000 $ 14.00 Fixed expenses 55,000 Net operating income $ 43,000 Required: (Consider each case independently): What would be the revised net operating income per month if the sales volume increases by 30 units? What would be the revised net operating income per month if the sales volume decreases by 30 units? What would be the revised net operating income per month if the sales volume is 6,000 units