Government economists of a developing country determined that the purchase of imported perfume is related to a proposed "luxury tax" by the formula 
, 
, where N(x) measures the percentage of normal consumption of perfume when a "luxury tax" of x% is imposed on it. Find the rate of change of N(x)
for a tax of 70%.
?
A. ?
B. ?
C. ?
D. 
Answer: D
Mathematics
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A. -? < x < 0 B. -? < x < ? C. 0 < x < ? D. 0 ? x < ?
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