need some help on these stats problems that i am confused about?

1. market research in a particular city indicated that during a week 18% of all adults watched a television program oriented to business and financial issues,

12% read a publication oriented to these issues, and 10% do both.

(a) what is the probability that an adult i this city who watches a television program oriented to business and financial issues reads a publication oriented to these issues?

(b) what is the probability that an adult in this city who reads a publication orientated to buiseness and financial issues watches television program oriented to these issues?

2. a conference began at noon with two parallel sessions. the session on portfolio management was attended by 40% of the delegates, while the session on chartism was attended by 50%. the evening session consisted of aa talk titled, "is the random walk dead?" this was attended by 80% of all delegates.

(a) if attendance at the sessions on portfolio management and chartism are mutually exclusive, what is the probability that a randimly chosen delegate attended at least one of these sessions?

(b) if attendance at the portfolio management and evening sessions are statistically independent, what is the probability that a randomly chosen delegate attended at leaset one of these sessions?

(c) of those attending the chartism session, 73% also attended the evening session. what is the probability that a randomly chosen delegate attended at least one of these two sessions?

3. a lawn - care service makes telephone solitications, seeking customers for the coming season. a review of the records indicated that 15% of these solitications produced new customers, adn that of these new customers, 80% had used some rival service the presious year. it was also estimated that all solitication calls made, 60% were to people who had used a rival service the previous year. what is the probabiltity that a call to a person who used a rival service the previous year will produce a new customer for the lawn-care serice?

thanks