whether your car is wet in the morning (W) is dependent on whether it rained last night (R) or not, however, other factors may have lead to your car being wet. The following are the probabilities of such events:

P(R) = 0.4

P(W|R) = 0.8 (probability that car is wet given it rains)

Probability car is wet given it doesn't rain = 0.2

what is the probability that your car is wet in the morning?