Can anyone help me understand this please? thanks

Perfect Stampers makes and sells aftermarket hub caps. The variable cost for each hub cap is $4.75 and the hub cap sells for $9.95. Perfect Stampers has fixed costs per month of $3,120. Compute the contribution margin per unit and break-even sales in units and in dollars for the month. Round the contribution margin per unit to two decimal places. Contribution margin Break even sales in units units Break even sales in dollars