Randall Realty Has Two Rental Properties Available

Randall Realty has two rental properties available.The agent assesses a 0.6 probability that property A will be rented by the end of the month, and a probability of 0.8 that property B will be rented by the end of the month.She also believes there is a 0.5 probability that both properties will be rented by the end of the month.What is the probability that both properties fail to be rented by the end of the month?

A) .1
B) .8
C) .4
D) .48
E) .32