The number of fish in a lake t t\,t years from now is Ft F_t\,Ft where
F0=800 F_0 = 800 F0=800 Ft+1=1.02(Ft−20) F_{t+1} = 1.02(F_t - 20) Ft+1=1.02(Ft−20)Work out the number of fish in the lake 3 years from now.
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