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a. Which inputs are fixed inputs? Which are the variable inputs? b. How much are your fixed costs? c. What is the variable cost of producing 20 units of output? d. How many units of the variable input should be used to maximize profits? e. What are your maximum profits? f. Over what range of variable input usage do increasing marginal returns exist? g. Over what range of variable input usage do decreasing marginal returns exist? h. Over what range of variable input usage do negative marginal returns exist?

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