In the month of june, jose hebert's beauty salon gave 4,000 haircuts, shampoos, and hair colorings at an average price of $30 each. during the month, fixed costs were $16,800 and variable costs were 75% of sales. compute contribution margin, break-even point, and margin of safety. 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. compute the margin of safety in dollars and as a ratio.