If a culture enters the exponential growth phase with 72,333 cfu per mL, and continues in the exponential growth phase for 1,025 minutes with a growth constant of 0.03467 min-1, what is the final dilution required to produce 274 cfu on a petri dish? This question is asking for the cumulative dilution, including the 0.1 mL transferred to the petri dish. The cumulative dilution is equal to the ratio of cfu on the petri dish to Ct.