Required information Skip to question $[$The following information applies to the questions displayed below.$]$ Data for Hermann Corporation are shown below: Per Unit Percent of Sales Per Unit Percent of Sales Selling price $ $90100\%$ Variable expenses $6370$ Contribution margin $ $2730\%$ Fixed expenses are $$78,000$ per month and the company is selling $3,500$ units per month. $1-$a$.$ How much will net operating income increase $($decrease$)$ per month if the monthly advertising budget increases by $$8,300,$ the monthly sales volume increases by $100$ units, and the total monthly sales increase by $$9,000?1-$b$.$ Should the advertising budget be increased? Data for Hermann Corporation are shown below: Per Unit Percent of Sales Selling price $ $90100\%$ Variable expenses $6370$ Contribution margin $ $2730\%$ Fixed expenses are $$78,000$ per month and the company is selling $3,500$ units per month. $2-$a$.$ 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 $20\%.2-$b$.$ Should the higher$-$quality components be used?