?A retail sporting goods store estimates that weekly sales and weekly advertising costs are related by the equation 
. The current weekly advertising costs are $1,500, and these costs are increasing at a rate of $135 per week. Find the current rate of change of weekly sales.
?
A. ?156,600 dollars per week
B. ?158,880 dollars per week
C. ?85,980 dollars per week
D. ?83,700 dollars per week
E. ?823,080 dollars per week
Answer: A
Mathematics
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.
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