A competitive firm's production function is f(x 1 , x 2 ) = 4x 1 1/2 + 6x 2 1/2 . The price of factor 1 is 1 and the price of factor 2 is 2. The price of output is 4. What is the pro fi t-maximizing quantity of output?
A.
68
B.
136
C.
64
D.
148
E.
56
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