A firm has a cost function given by: c(y) = yz + y + k. (a) What is the fixed cost FC for the firm? What is the variable cost VC(y) of the firm? (5 pts) (b) What is the firm's average cost AC(y), average variable cost AVC(y), and marginal cost MC(y)? (10 pts) (c) Show that the technology used by the firm exhibits decreasing returns to scale (DRS). Hint: you will need to use the MC(y). Moreover, does a change in & affect the firm's output and profit? Explain. (5 pts) (d) What is the difference between SRAC(y) and LRAC(y). (5 pts)