An Initial population of harbour seal is 1000 in Washington State. The maximum carrying capacity of the Washington State for harbour seal is 12000. There is a real out of control hunting problem and it causes a 0.6 death rate in a year. Also, the harbour seal has a birth rate of 0.75 in a year under protections and lives 30 years. However, the accumulation of waste products reduced the environment's carrying capacity of harbour seals to half of it. Model the situation and select the correct interval of the population of harbour seals at 30 years.

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