In the month of June, Mandeep's Beauty Salon gave 3, 300 haircuts, shampoos and permanents at an average price of $31. During the month, fixed costs were $22, 300 and variable costs were 75% of sales. a. Determine the contribution margin in dollars, per unit, and as a ratio. Contribution margin (in dollars) $ Contribution margin (per unit) $ Contribution margin (ratio)