Problem #4. (15 points) 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. Show and label all calculations Instructions (a) Determine the contribution margin in dollars, per unit, and as a ratio. (b) Using the contribution margin technique, compute the break-even point in dollars and in units. (c) What sales are necessary to earn an income of $50,000? (d) Compute the margin of safety dollars and as a ratico