Ret Selling price Variable expenses Contribution margin Per Unit $ 95 57 $ 38 Percent of Sales 1000 60 40% Fixed expenses are $79,000 per month and the company is selling 3,600 units per month. Exercise 6-5 Part 1 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 $17,100? 1-b. Should the advertising budget be increased? 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 $8,400 and monthly sales increase by $17,100? (Round any unit calculations up to the nearest whole unit.) Net operating decreases by s income 1,800