Marino company is currently selling 10,000 units of its product per month at $9.80 per unit for total monthly sales of $98,000. the company’s variable expenses are $3.90 per unit and its monthly fixed expenses total $9,800. an increase in the advertising budget of $3,800 is expected to increase its monthly sales by 1,000 units for total monthly sales of $107,800. this proposal will cause net operating income to: