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18. Suppose x, and x, are used in fixed proportions such that y = min{x,,2x,}. At the point x, = x, = 4, the MP, is and the MP, is A. 1; 2 B. 1; 0 * * * C. 0; 1 D. 2; 0 E. 0; 2 19. A competitive firm has a production function Y = 24 + 10K. If w = $2 and r = $8, what will be the minimum cost of producing 50 units of output? A. $40 * * * B. $50 C. $45 D. [None of the above]