Question: A firm's production function is given by Q=KL. The marginal products of labor and capital are, respectively, MPL=K and MPK=L. The wage rate of labor

A firm's production function is given by Q=KL. The marginal products of labor and capital are, respectively, MPL=K and MPK=L. The wage rate of labor is w=$10 and the rental rate of capital is r=$20. The firm wants to produce 1,800 units of output in the most efficient way possible. How much does the firm spend?

A) $2,000

B) $1,300

C) $1,200

D) $1,100

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