In June, Oriole Salon gave 3,600 haircuts, shampoos, and permanents at an average price of $45. During the month, fixed costs were $36,000 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 decimol places, eg. 52.75 and final answer to 0 decimal places, es. 5,275.) Contribution margin (in dollars) Contribution margin (per unit) Contribution margin (ratio) %