Exercise 11-9 Mixed cost at different levels of activity LO 11-1 Rundle Corporation paid one of its sales representatives $5,500 during the month of March. The rep is paid a base salary plus $11 per unit of product sold. During March, the rep sold 200 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months: May I T April 240 150 250 Month Number of units sold Total variable cost Total fled cost Total salary cost