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

Total Per Unit

Sales $(28,200$ units$)$ $ $253,800$ $ $9\mathrm{.}00$

Variable expenses $152,2805\mathrm{.}40$

Contribution margin $101,520$ $ $3\mathrm{.}60$

Fixed expenses $59,220$

Net operating income $ $42,300$

Required:

$($Consider each of the four requirements independently$)$:

$1.$ Assume the sales volume increases by $4,512$ 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{.}30$ 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 $$1\mathrm{.}30$ per unit, fixed expenses increase by $$9,000,$ and the number of units sold decreases by $4\%?$

$4.)$What is the revised net operating income if the selling price per unit increases by $20\%,$ variable expenses increase by $40$ cents per unit, and the number of units sold decreases by $15\%?$