A population y changes at a rate modeled by the differential equation = 0.2y(1000-y), where t is dt measured in years. What are all values of y for which the population is increasing at a decreasing rate? (A) 500 only (B) 0 < y < 500 only (C) 500 < y < 1000 only (D) 0 < y < 1000 (E) y > 1000 O A B

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