Bumpy Co.'s contribution format income statement for the most recent month is shown below: Total Per Unit Sales (7,300 units) $ 255,500 $ 35.00 Variable expenses 146,000 20.00 Contribution margin Fixed expenses 109,500 54,000 $ 15.00 Net operating income $ 55,500 What would be the revised net operating income per month if the sales volume increases by 40 units? Do not include a dollar sign in your response.