Each unit of a product can be made on either machine A or machine B. The nature of the machines makes their cost functions differ. 12 Machine A: C(x) = 40 + x 6 Machine B: C(y) - 240 + 9 Total cost is given by C(x,y) = C(x) + C(y). How many units should be made on each machine in order to minimize total costs if x + y = 25,760 units are required? The minimum total cost is achieved when units are produced on machine A and units are produced on machine B. (Simplify your answer.)