I need help with this practice!

I answered first 3questions a-1 23.250 a-2 7.50 a-3 25%

In the month of June, Mandeep's Beauty Salon gave 3,100 haircuts, shampoos and permanents at an average price of $30. During the month, fixed costs were $20,900 and variable costs were 75% of sales. Determine the contribution margin in dollars, per unit, and as a ratio. (Round contribution margin per unit to 2 decimal places, e.g. 5.27.) Contribution margin (in dollars) $ Contribution margin (per unit) $ Contribution margin (ratio) Using the contribution margin technique, compute the break-even point in dollars and in units. (Round answers to o decimal places, e.g. 1,225.) Break-even points Break-even point units Compute the margin of safety in dollars and as a ratio. (Round answers to O decimal places, e.g. 1,225.) $ Margin of safety Margin of safety ratio