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A retail store estimates that weekly sales s and weekly advertising costs x​ (both in​ dollars)...

A retail store estimates that weekly sales s and weekly advertising costs x​ (both in​ dollars) are related by s= 50,000 - 30,000e^(-0.0005x) The current weekly advertising costs are ​$2,000​, and these costs are increasing at a rate of $400 per week. Find the current rate of change of sales.

Math   Calculus   
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