Under optimal conditions, the growth of a certain strain of E. Coli is modeled by the Law
of Uninhibited Growth N(t) = Noekt where No is the initial number of bacteria and t is the
elapsed time, measured in minutes. From numerous experiments, it has been determined that
the doubling time of this organism is 20 minutes. Suppose 1000 bacteria are present initially.
Given that k = 0.035, about how long until there is 9,000 bacteria?