Assume (1) total sales are $300,000. (2) the direct labor cost of $40,000 is 20% of total conversion costs and 25% of total prime costs, (3) the total selling and administrative expense is $62,000.(4) the only variable selling and administrative expense is sales commissions of 7% of sales, (5) all manufacturing overhead costs are fixed costs, and (6) there are no beginning or ending Inventories What is the total contribution margin