Government economists of a developing country determined that the purchase of imported perfume is related to a proposed "luxury tax" by the following formula where N(x) measures the percentage of normal consumption of perfume when a "luxury tax" of x% is imposed on it. N(x) = 10,000 − 40x − 0.02x2 (0 ≤ x ≤ 200) Find the rate of change of N(x) for taxes of 10%, 100%, and 145%. (Round your answers to three decimal places.) 10% tax 100% tax 145% tax