Other information for the month includes: Variable manufacturing costs $25.00 per unit Variable marketing costs $5.00 per unit Fixed manufacturing costs $15.00 per unit Administrative expenses, all fixed $20.00 per unit Ending inventories: Direct materials -0 - WIP - 0 - Finished goods 250 units What is cost of goods sold per unit using variable costing? A. $30.00 B. $45.00 C. $25.00 D. $65.00