Posted by **Nathan** on Monday, March 1, 2010 at 9:49pm.

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

s=50000−430000e^(−00009x)

The current weekly advertising costs are 2000 dollars and these costs are increasing at the rate of 300 dollars per week. Find the current rate of change of sales.

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