Which of the following sets of economic data is minimizing the cost of producing a given level of output?
A. MPL = 20, MPK = 40, w = $32, r = $16.
B. MPL = 40, MPK = 40, w = $16, r = $32.
C. MPL = 40, MPK = 20, w = $16, r = $32.
D. MPL = 20, MPK = 40, w = $16, r = $32.
Answer: D
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