Please assist with the steps for the word problem below. Government economists of a developing country determined that the purchase of imported perfume is related to a purposed "luxury tax" by the formula N(x)=square root of (12,000-50x-0.04x^2), 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 N9x) for a tax of 70%.

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