Data concerning Wislocki Corporation's single product appear below:

Per Unit Percent of Sales

Selling price $ $160100\%$

Variable expenses $4025\%$

Contribution margin $ $12075\%$

Fixed expenses are $$1,041,000$ per month. The company is currently selling $9,600$ 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 $$13$ per unit. In exchange, the sales staff would accept an overall decrease in their salaries of $$105,000$ per month. The marketing manager predicts that introducing this sales incentive would increase monthly sales by $400$ units. What should be the overall effect on the company's monthly net operating income of this change?