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An inferior product with an extensive advertising campaign does well when it is released, but sales...

An inferior product with an extensive advertising campaign does well when it is released, but sales decline as people discontinue use of the product. If the sales S (in thousands of dollars) after t weeks are given by the following formula, what is the rate of change of sales when t = 10? (Round your answer to two decimal places.) S(t) = 250t/(t + 4)^2 t ≥ 0

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