(2) A firm has a production function given by Q =. Suppose that each K0.75L0.75unit of capital costs R and each unit of labor costs W. Answer the following questions: (a) Derive the long-run demands for capital and labor. (b) Derive the total cost curve. (c) Derive the long-run: (i) average total cost curve. (ii) marginal cost curve. (d) How do marginal and average costs change with increases in output. Explain