8.25. The production function Q ! KL " M has marginal products MPK ! L, MPL ! K, and MPM ! 1. The input prices of K, L, and M are 4, 16, and 1, respectively.

The firm is operating in the short run, with K fixed at 20 units and M fixed at 40. What is the short-run total cost of producing 400 units of output?

K ! 50)