Please help me answer this question asap

HarrisCorporation produces a single product. Last year, Harris manufactured 35,250 units and sold 29,700 units. Production costs for the year were as follows:

Fixed manufacturing overhead$634,500

Variable manufacturing overhead$267,900

Direct labor$179,775

Direct materials$257,325

Sales were $1,351,350, for the year, variable selling and administrative expenses were $151,470, and fixed selling and administrative expenses were $257,325. There was no beginning inventory. Assume that direct labor is a variable cost.

The contribution margin per unit would be: (Do not round intermediate calculations.)

$20.40 per unit $15.90 $25.50 $21.50