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A car wash firm calculates that its daily production (in number of cars washed) depends on...

A car wash firm calculates that its daily production (in number of cars washed) depends on the number n of workers it employs according to the formula

P = 40n − 0.05n2 cars.

Calculate the marginal product of labor at an employment level of 50 workers. HINT [See Example 3.]

This means that, at an employment level of 50 workers, the firm's daily production will increase at a rate of  cars per additional worker it hires.

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