Data for Hermann Corporation are shown below: Percent of Per Unit Sales Selling price $95 100% Variable expenses 57 60 Contribution margin $ 38 40% Fixed expenses are $79,000 per month and the company is selling 3,600 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,400 and monthly sales increase by $17,000? 1-b. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Req 1A Req 18 How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $8,400 and monthly sales increase by $17,000? (Do not round intermediate calculations.) Net operating income by