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1. A production function relates the quantity produced, Q, to the units of labour, L and takes the form
Q=30L to the power of 5/4

Find the marginal product of labour dQ/dL
Evaluate this when L=16 and interprete this result
2. This forum doesn't permit giving the full answer, but what you would do is to differentiate you would use the standard 'times by the power, subtract 1 from the power' rule. This gives you dQ/dL. Then plug in L=16 to get your answer. I can't help you much with interpreting the result as that requires subject-specific knowlege.

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