Division Corporation prepared the following contribution format income statement based on sales volume of $10,000$ units $($the relevant range of production is $5,000$ units to $15,000$ units$).$

Sales $$200,000$

Variable expense $120,000$

Contribution margin $80,000$

Fixed expenses $60,000$

Net operating Income $$20,000$

Answer the following questions:

$1.$ What is the contribution margin per unit?

$2.$ What is the contribution margin ratio?

$3.$ What is the variable expense ratio?

$4.$ If sales increased to $10,001$ units, what would be the increase in net operating income?

$5.$ If sales declined to $9,000$ units, what would be the net operating income?

$6.$ If the selling price increased by $$2$ per unit and the sales volume decreased by $1,000$ units, what would be the net operating income?

$7.$ If the variable cost per unit increased by $$1,$ spending on advertising increased by $$15,000$ and unit sales increased by $2,500$ units, what would be the net operating income?

$8.$ What is the break$-$even point in unit sales?

$9.$ What is the breakeven point in sales dollars?

$10.$ How many units must be sold to achieve a target profit of $$50,000?$

$11.$ What is the margin of safety in dollars? What is the margin of safety percentage?

$12.$ What is the degree of operating of operating leverage?