Whirly Corporation’s contribution format income statement for the most recent month is shown below: Total Per Unit Sales (8,000 units) $ 248,000 $ 31.00 Variable expenses 144,000 18.00 Contribution margin 104,000 $ 13.00 Fixed expenses 55,700 Net operating income $ 48,300 Required: (Consider each case independently): 1. What would be the revised net operating income per month if the sales volume increases by 90 units