[問題] 關於logistic equation的問題

[kuogary1 (小郭)]

(3) A group of 1200 Formosan Landlocked  Salmon  are released into a mountain
    lake. It is estimated that the capacity of the lake for the species is
    20400. After the first year, there are 2000 Formosan Landlocked Salmon
    in the lake.
    (a) Write a logistic  equation that models the number of Formosan
        Landlocked Salmon in the lake (8 points).
    (b) Find the number of Formosan Landlocked Salmon in the lake after
        8 years (8 points).

有人可以告訴我這題到底在講什麼嗎？
他沒有給我們年增加速率，該怎麼列式子阿？

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人變少了，可憑弔的遺跡也多了。

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→ ShawSean    :初始值是1200，過了一年變成2000，不就有速率了？