In the month of June, Ivanhoe Hebert's Beauty Salon gave $3,500$ haircuts, shampoos, and hair colorings at an average price of $$50.$ During the month, fixed costs were $$17,500$ 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, e$.$g$.5\mathrm{.}75.)$

Contribution margin

Unit contribution margin

Contribution margin ratio

$\%$

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