Which one of the following is likely to be a cost driveCompany is currently producing AND selling 10, 01 units of product A. At this level, the total product cost was \$60,000 . This included $10,000 direct materials, \$20,000 direct labor and $30,000 manufacturing overhead cost, which included 20\% fixed manufacturing overhead cost. The selling and administrative expenses were $ 100, 000 , which included \$60,000 variable selling and administrative costs. Assume that the selling price per unit $20, how much was the total contribution margin?