Required information

$[$The following information applies to the questions displayed below.$]$

Data for Hermann Corporation are shown below:

Fixed expenses are $$81,000$ per month and the company is selling $3,800$ units per month.

Required $($see below for a hint if you get stuck$)$:

$1-$a$.$ How much will net operating income increase $($decrease$)$ per month if the monthly advertising budget increases by $$8,600$ and the

monthly sales volume increases by $100$ units?

$1-$b$.$ Should the advertising budget be increased?

Complete this question by entering your answers in the tabs below.

How much will net operating income increase $($decrease$)$ per month if the monthly advertising budget increases by $$8,600,$

the monthly sales volume increases by $100$ units, and the total monthly sales increase by $$10,500?($Do not round

intermediate calculations.$)$