A computer virus spreads via email.Once a computer gets the virus, it can spread it only for a day, after which the computer remains compromised, but it is no longer contagious.A hacker started spreading the virus on December 1 by sending emails to 18 computers. Assume that each infected computer can potentially spread the virus to an average of 2 uncompromised computers.

1. If no security measures are introduced, how many infected computers will there be, in total, on December 16 if the infection rate stays constant at 2?
2. Better firewalls could have reduced the infection rate by 58% .How many computers could potentially have been saved by December 16, if the firewalls had been in place after the first 18 computers were infected in the first round?