Zeeb Corporation produces and sells a single product. Data concerning that product appear below: Fixed expenses are $366,000 per month. The company is currently selling 6.100 units per month. The marketing manager believes that a $23,000 increase in the monthly advertising budget would result in a 150 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? (Negative amount should be indicated by a minus sign. Omit the "$" sign in your response.)