Required information [The following information applies to the questions displayed below.] Data for Hermann Corporation are shown below: Selling price Variable expenses Contribution margin Per Unit $ 60 Percent of Sales 39 100% 65 $ 21 35% Fixed expenses are $72,000 per month and the company is selling 4,200 units per month. Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,600, the monthly sales volume increases by 100 units, and the total monthly sales increase by $6,000? 1-b. Should the advertising budget be increased? Req 1A Req 1B How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,600, the monthly sales volume increases by 100 units, and the total monthly sales increase by $6,000? (Do not round intermediate calculations.) Net operating income by < Req 1A Req 1B > 2-a. Refer to the original data. How much will net operating income increase (decrease) per month if the company uses higher-quali components that increase the variable expense by $4 per unit and increase unit sales by 25%. 2-b. Should the higher-quality components be used? Complete this question by entering your answers in the tabs below. Req 2A Req 2B Refer to the original data. How much will net operating income increase (decrease) per month if the company uses higher- quality components that increase the variable expense by $4 per unit and increase unit sales by 25%. Net operating income by