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"Suppose the population P(t), measured in millions of people, of a country satisfies the differential equation dP/dt = kP(230-P) with k constant. Its population in 1940 was 135 million and was then growing at the rate of 1 million per year. Predict this country's population for the year 1991."
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I got up to solving P=(P-230)e^(230kt)e^C and now i am stuck
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