In June, Ivanhoe Salon gave $4,000$ haircuts, shampoos, and permanents at an average price of $$40.$ During the month, fixed costs were $$35,040$ and variable costs were $70\%$ 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$)$

$\%$

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