need some help with this part thank you

In the month of June, Jose Hebert's Beauty Salon gave 4,000 haircuts, shampoos, and permanents at an average price of $30. During the month, fixed costs were $16,800 and variable costs were 75% of sales. Contribution margin in dollars: Unit contribution margin: $30$22.5($3075%)=$7.5. Contribution margin ratio: $7.5$30=25%. [(4,000$30)($120,00075%)=$30,000][(UnitssoldUSP)(Sales$VCas%ofsales)=CM][$30($3075%)=$7.5][USP(USPVCas%ofsales)=UCM]($7.5+$30=25%)(UCM+USP=CMratio) Using the contribution margin technique, compute the break-even point in dollars and in units. Break-even point Break-even point units