Exercise 11-9A (Algo) Mixed cost at different levels of activity LO 11-1, 11-2 Fanning 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 140 units. Required Calculate the total monthly cost of the sales representative's salary for each of the following months. Answer is complete but not entirely correct. Month Number of units April May June July sold 180) 90 190 100 Total variable cost S 2,160 $ 1,080 $ 2,280 1,200 Total fixed cost 4,320 4,320 4,320 4,320 Total salary cost $ 6,480 S 5,400 s 6,600 5,520