Exercise 11-9A (Algo) Mixed cost at different levels of activity LO 11-1, 11-2 Thornton Corporation paid one of its sales representatives $4,500 during the month of March. The rep is paid a base salary plus $11 per unit of product sold. During March, the rep sold 110 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months. April May June 150 60 160 70 Month Number of units sold Total variable cost Total fixed cost Total salary cost d