I don't know what I'm doing wrong. I tried both 1900 and -1900 and it says it's wrong. Can someone work this out for me?

Return to question 2 ! Required information Part 1 of 2 [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: 2 points Selling price Variable expenses Contribution margin Per Unit $ 115 69 Percent of Sales 100% 60 $ 46 40% Fixed expenses are $83,000 per month and the company is selling 2,500 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,800 and monthly sales increase by $17,250? 1-b. Should the advertising budget be increased? Return to question - y - Pe. 2 Part 1 of 2 Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,800 and monthly sales increase by $17,250? 1-b. Should the advertising budget be increased? 2. points Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. Reg 1A Reg 1B How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,800 and monthly sales increase by $17,250? (Round any unit calculations up to the nearest whole unit.) Net operating income decreases by 1,900 X