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

Required:

$($Consider each case independently$)$:

What is the revised net operating income if unit sales increase by $15\%?$

What is the revised net operating income if the selling price decreases by $$1\mathrm{.}40$ per unit and the number of units sold increases by

$19\%?$

What is the revised net operating income if the selling price increases by $$1\mathrm{.}40$ per unit, fixed expenses increase by $$8,000,$ and the

number of units sold decreases by $5\%?$

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 $5\%?$