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For each of the below production functions, find the minimum cost of producing 2 units of output when input prices are W1 = 5 and w2 = 4. Wherever rounding is needed, please round to 3 decimal points. a) (2 points) f(Z1, Z2) = [min { z1, 3z2}12 b) (2 points) f(z1 , Z2) = Z1 (Z2 - 8) K