its a two part question

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 $140 91 $ 49 Percent of Sales 1009 65 35 Fixed expenses are $88,000 per month and the company is selling 3,000 units per month Required: 1-a. How much will not operating income increase (decrease) per month if the monthly advertising budget increases by $9,300 and monthly sales increase by $21,000? 1-6. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Den 1 Reg 13 Required: 1-a. How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,300 and monthly sales increase by $21,000? 1-b. Should the advertising budget be increased? Complete this question by entering your answers in the tabs below. Req la Reg 1B How much will net operating income increase (decrease) per month if the monthly advertising budget increases by $9,300 and monthly sales increase by $21,000? (Round any unit calculations up to the nearest whole unit.) Net operating income by BA Reg 13 > Complete this question by entering you Req 1A Req 1B Should the advertising budget be increased? Yes O No