The number of bacteria in a sample t t\,t hours from now is Bt B_t\,Bt where
B0=1200 B_0 = 1200 B0=1200 Bt+1=1.05(Bt−50) B_{t+1} = 1.05(B_t - 50) Bt+1=1.05(Bt−50)Work out the number of bacteria in the sample 3 hours from now.
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