Chapter 6: CVP/Break-even/Contribution Margin Hamiel Corporation produces and sells a single product. Data concerning that product appear below: Selling price Per Unit Percent of Sales $ 140 100% 28 20 % Variable expenses Contribution margin $ 112 80 % Fixed expenses are $1,055,000 per month. The company is currently selling 9,700 units per month. Required: The marketing manager would like to introduce sales commissions as an incentive for the sales staff. The marketing manager has proposed a commission of $10 per unit. In exchange, the sales staff would accept an overall decrease in their salaries of $101,000 per month. The marketing manager predicts that introducing this sales incentive would increase monthly sales by 300 units. What should be the overall effect on the company's monthly net operating income of this change.