Stuart Corporation paid one of its sales representatives $4,500 during the month of March. The rep is paid a base salary plus $12 per unit of product sold. During March, the rep sold 100 units.

Required

Calculate the total monthly cost of the sales representatives salary for each of the following months:

Month	April	May	June	July
Number of units	140	50	150	60
Total variable cost
Total fixed cost
Total salary cost