Zachary Corporation paid one of its sales representatives $8,500 during the month of March. The rep is paid a base salary plus $13 per unit of product sold. During March, the rep sold 150 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months: May June July April 190 100 200 110 Month Number of units Total variable cost Total fixed cost Total salary cost $ 0 $ 0 $ 0 $ 0