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The rate of depreciation dV/dt of a machine is inversely proportional to the square of t+1,...

The rate of depreciation dV/dt of a machine is inversely proportional to the square of t+1, where V is the value of the machine t years after it was purchased. The initial value of the machine was $600,000, and its value decreased $200,000 in the first year. Estimate its value after 4 years. (Round your answer to the nearest whole number)
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