A retail store estimates that weekly sales s and weekly advertising costs x (both in dollars) are related bys 80,000 30,000 e00020The current weekly advertising costs are $4,000, and these costs are increasing at a rate of $400 per week. Find the current rate of change of sales The current rate of change of sales is $ (Round to the nearest dollar as needed.) per week Enter your answer in the answer box. hp

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