SOLUTION: The relative growth rate for a certain type of bacteria population is 85% per hour. A small culture has formed and in just 2 hours the count shows to be 12,500 bacteria in the cult

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The exponential growth law is 

    n(t) = .


In 2 hours

    12500 = .


Therefore,   =  = 3652  (rounded).


ANSWER.  Initial number of bacteria is about 3652.