Exercise 5-1 (Algo) The Effect of Changes in Sales Volume on Net Operating Income [LO5-1] Whirly Corporation's contribution format income statement for the most recent month is shown below. Sales (7,500 units) Variable expenses Contribution margin Fixed expenses Net operating income Total $ 262,500 142,500 120,000 Per Unit $ 35.00 19.00 $ 16.00 54,300 $ 65,700 What would be the revised net operating income per month if the sales volume is 6,500 units? 1. Revised net operating income