DesRoches Electronics Corp. produces and sells headphones for $75.00 per unit. In the first month of operation, 2,000 units were produced and 1,750 units were sold. Actual fixed costs are the same as the amount budgeted for the month. Other information for the month includes: Variable manufacturing costs $20.00 per unit Variable marketing costs $3.00 per unit Fixed manufacturing costs $7.00 per unit Administrative expenses, all $15.00 per unit fixed Ending inventories: Direct materials O WIP O Finished goods 250 units What is cost of goods sold per unit using variable costing? O $23 O $45 O $20 O $30