A biologist doing an experiment has a bacteria population cultured in a petri dish. After measuring, she finds that there are 97.4 million bacteria infected with the zeta-virus and 63 million infection-free bacteria. Her theory predicts that 70% of infected bacteria will remain infected over the next hour, while the remaining of the infected manage to fight off the virus in that hour Similarly, she predicts that 40% of the healthy bacteria will remain healthy over the hour while the remaining of the healthy will succumb to the affliction. Modeling this as a Markov chain, use her theory to predict the population of non-infected bacteria after 3 hour(s). [Round to 3 significant figures.) 107 million ob) 68.6 million c) 53.5 million od) 91.8 million