necti Saved Zachary Corporation paid one of its sales representatives $6,000 during the month of March. The rep is paid a base salary plus $13 per unit of product sold. During March, the rep sold 170 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months. ces Month April May June July Number of units sold 210 120 220 130 Total variable cost Total fixed cost Total salary cost $ 0 $ 0 $ 0 $ 0