Police plan to enforce speed limits by using radar traps at four different locations within the city limits. The radar traps at each of the locations L1, L2, L3, and L4 will be operated 30%, 20%,40%, and 30%of the time. A person who is speeding on her way to work has probabilities of 0.1, 0.2, 0.6, and 0.1, respectively, of passing through these locations. If the person received a speeding ticket on her way to work, what is the probability that she passed through the radar trap located at L4?