The Pacific halibut fishery has been modeled by the differential equation dy/dt = ky (1 y/K)

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The Pacific halibut fishery has been modeled by the differential equation dy/dt = ky (1 – y/K) where y (t) is the biomass (the total mass of the members of the population) in kilograms at time (measured in years), the carrying capacity is estimated to be K = 8 X 107 kg, and k = 0.71 per year.
(a) If y (0) = 2 X 107 kg, find the biomass a year later.
(b) How long will it take for the biomass to reach 4 X 107kg?
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