In the month of April, Avante Salon gave 2,500 haircuts, shampoos, and permanents at an average price of $40. During the month, fixed costs were $20,000 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) s Contribution margin (ratio) se