Miller Company$$s contribution format income statement for the most recent month is shown below:

Total Per Unit

Sales $(21,600$ units$)$ TOTAL: $ $194,400$ PRICE PER UNIT: $ $9\mathrm{.}00$

Variable expenses TOTAL : $$116,640$ PRICE PER UNIT $5\mathrm{.}40$

Contribution margin TOTAL : $$77,760$ PRICE PER UNIT $ $3\mathrm{.}60$

Fixed expenses $$45,360$

Net operating income $ $32,400$

$1.$ Assume the sales volume increases by $3,456$ units:

A$.$ What is the revised net operating income?

B$.$ What is the percent increase in unit sales?

C$.$ Using the most recent month$$s degree of operating leverage, what is the percent increase in net operating income?

$2.$ What is the revised net operating income if the selling price decreases by $$1\mathrm{.}20$ per unit and the number of units sold increases by $24\%?$

$3.$ What is the revised net operating income if the selling price increases by $$1\mathrm{.}20$ per unit, fixed expenses increase by $$9,000,$ and the number of units sold decreases by $6\%?$

$4.$ What is the revised net operating income if the selling price per unit increases by $10\%,$ variable expenses increase by $20$ cents per unit, and the number of units sold decreases by $15\%?$