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 = 5. Wherever rounding is needed, please round to 3 decimal points. a) (3 points) f(z1, Z2) = [min{ z1, 3z2}]z b) (3 points) f(Z1, Z2) = Z1(Z2 - 8) where z1 > 0 and z2 > 8