In June, Crane Salon gave $3,600$ haircuts, shampoos, and permanents at an average price of $$45.$ During the month, fixed costs were $$33,750$ and variable costs were $75\%$ of sales.

$($a$)$

Determine the contribution margin in dollars, per unit, and as a ratio. $($Round per unit value to $2$ decimal places, e$.$g$.52\mathrm{.}75$ and final answer to $0$ decimal places, e$.$g$.5,275.)$

Contribution margin $($in dollars$)$

$

Contribution margin $($per unit$)$

$

Contribution margin $($ratio$)$