Shelhorse Corporation produces and sells a single product. Data concerning that product appear below:

Per Unit Percent of Sales

Selling price $ $240100\%$

Variable expenses $6025\%$

Contribution margin $ $18075\%$

Fixed expenses are $$364,000$ per month. The company is currently selling $5,900$ units per month.

Required:

The marketing manager believes that a $$21,000$ increase in the monthly advertising budget would result in a $130$ unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change?