A retail store estimates that weekly sales s and weekly advertising costs x (both in dollars) are related by s=70000−450

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A retail store estimates that weekly sales s and weekly advertising costs x (both in dollars) are related by s=70000−450

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A retail store estimates that weekly sales s and weeklyadvertising costs x (both in dollars) are related bys=70000−450000e^−0.0005x.
The current weekly advertising costs are 2000 dollars and thesecosts are increasing at the rate of 300 dollars per week.
Find the current rate of change of sales.
Rate of change of sales __________
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