7. A commercial fishery is estimated to have carrying capacity 40 tons of salmon. Suppose the annual growth rate of total salmon population P (measured in tons) is governed by the logistic equation P' = P(1 – P/40) and initially there are 30 tons of fish. (i) What is the fish population after 1 year? (You may use e = 2.72.) Suppose that the owner of the fishery decides to harvest h tons of salmon annually at a constant rate. Then (ii) ( What is the differential equation governing the fish population now? (iii) What is the maximun sustainable harvesting rate? (Justification is required.)

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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7. A commercial fishery is estimated to have carrying capacity 40 tons of salmon. Suppose
the annual growth rate of total salmon population P (measured in tons) is governed by the
logistic equation
P' = P(1 – P/40)
and initially there are 30 tons of fish.
(i)
What is the fish population after 1 year? (You may use e 2 2.72.)
Suppose that the owner of the fishery decides to harvest h tons of salmon annually at a
constant rate. Then
(ii) (
What is the differential equation governing the fish population now?
(iii)
What is the maximun sustainable harvesting rate? (Justification is required.)
Transcribed Image Text:7. A commercial fishery is estimated to have carrying capacity 40 tons of salmon. Suppose the annual growth rate of total salmon population P (measured in tons) is governed by the logistic equation P' = P(1 – P/40) and initially there are 30 tons of fish. (i) What is the fish population after 1 year? (You may use e 2 2.72.) Suppose that the owner of the fishery decides to harvest h tons of salmon annually at a constant rate. Then (ii) ( What is the differential equation governing the fish population now? (iii) What is the maximun sustainable harvesting rate? (Justification is required.)
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