3.40 As of February 4, 2020, the BBC reported 20,673 confirmed cases of COVID-19 were reported in main- land China. The data for confirmed cases at that time was shown to follow first-order exponential growth. The virus was expected to result in death for 2% of those people infected and the rate of infection was reported to double every 6.4 days. (a) How many cases of infection do you estimate to occur in 1 week time from February 4th