Please answer these clearly and show step-by-step in how you get the answer please. Thank you!

Problem #4" (15 points) In the month of April, Avante Salon gave 2,500 haircuts, shampoos, and permanents at an average month, fixed costs were S20.000 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? ) Compute the margin of safety dollars and as a ratio