Help Save & HW Exercise 11-9 Mixed cost at different levels of activity LO 11-1 Walton 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 130 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months: July April 170 erences June 1 80 May 8 0 Month Number of units sold Total variable cost Total foxed cost Total salary cost 90