The total revenue curve of a firm is R(g) 40q - 12q? and its %3D 400 average cost A(q) q - 12.85q + 20 + 30 where q is the firm's output. b. Derive an expression C(q) for the firm's total cost function. ii. Derive an expression II(g) for the firm's profit function. iii. Is the rate of change of profit increasing or decreasing when the ouput level of the firm is 10 units? i.

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