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Data for Hermann Corporation are shown below:

Per Unit Percent of Sales

Selling price $ $80100\%$

Variable expenses $4455$

Contribution margin $ $3645\%$

Fixed expenses are $$76,000$ per month and the company is selling $2,500$ units per month.

Required:

$1-$a$.$ How much will net operating income increase $($decrease$)$ per month if the monthly advertising budget increases by $$8,100,$ the monthly sales volume increases by $100$ units, and the total monthly sales increase by $$8,000?$

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