In the month of June, Sandhill Hebert's Beauty Salon gave $4,000$ haircuts, shampoos, and hair colorings at an average price of $$50.$ During the month, fixed costs were $$18,000$ and variable costs were $80\%$ of sales.

$($a$)$

Determine the contribution margin in dollars, per unit and as a ratio. $($Round contribution margin per unit to $2$ decimal places, eg$.5\mathrm{.}75.)$

Contribution margin

$

Unit contribution margin

Contribution margin ratio $\%$

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$($b$)$

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$($c$)$

The parts of this question must be completed in order. This part will be available when you complete the part above.