help with part c please

In June, Sheridan Salon gave 2,700 haircuts, shampoos, and permanents at an average price of $45. During the month, fixed costs were $27,000 and variable costs were 75% of sales. Determine the contribution margin in dollars, per unit, and as a ratio. (Round per unit value to 2 decimal places, e.g. 52.75 and final answer to 0 decimal places, e.g. 5,275.) Contribution margin (in dollars) $ Contribution margin (per unit) $ Contribution margin (ratio) (b) Using the contribution margin technique, compute the breakeven sales dollars and sales units. $ -even sales units units (c) Compute the margin of safety dollars and as a ratio. (Round answers to 0 decimal places, e.g. 5,275.) Margin of safety in dollars $ Margin of safety ratio