In the month of June, Carla Vista Hebert's Beauty Salon gave 3.000 haircuts, shampoos, and hair colorings at an average price of $50. During the month, fixed costs were $16,500 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, eg 5,75.) Contributionmargin Unit contributionmargin $ Contributionmargin ratio