A financial service company advertises its services in magazines, runs billboard ads on major highways, and advertises its services on the radio. The company estimates that there is a 0.10 probability that a given individual will see the billboard ad during the week, a 0.15 chance that he or she will see the ad in a magazine, and a 0.20 chance that she or he will hear the advertisement on the radio during the week. What is the probability that a randomly chosen member of the population in the area will be exposed to at least one method of advertising during a given week? (Assume independence.)