(21 points - 3 each) In the month of June, Nadine's Beauty Salon gave 2,500 haircuts, shampoos, and permanents at an average price of $40. During the month, fixed costs were $18,000 and variable costs were 70% of sales. Instructions (a1) Determine the contribution margin in total dollars. (a2) Determine the contribution margin in dollars per unit (a3) Determine the contribution margin as a ratio. (61) Using the contribution margin technique, compute the break-even point in dollars (62) Using the contribution margin technique, compute the break-even point in units. (c1) Compute the margin of safety dollars (c1) Compute the margin of safety as a ratio