Change in net operating income?

Data concerning Ulwelling Corporation's single product appear below Percent of Per Unit Sales Selling price $200 100% Variable expenses 38% Contribution margin $124 62% Fixed expenses are $1.038,000 per month. The company is currently selling 9.700 units per month. The marketing manager would like to commissions as an incentive for the sales staff marketing manager has a commission of exchange, the sales accept overall decrease in their salaries of $108,000 per month The marketing predicts that introducing this sales incentive would manager increase monthly sales by 370 units Required: What should be the overall effect on the company's monthly net operating income of this change? (Negative amount should be indicated by a minus sign.) Change in net operating income