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1. For the SR production function Q(L) = 25L + 5L^2 - 1/3L^3, at what level...

1. For the SR production function Q(L) = 25L + 5L^2 - 1/3L^3, at what level of labor do diminishing marginal returns set in? (Solve using a T-chart or calculus)

A. L=2
B. L=3
C. L=4
D. L=5
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