The probability that a franchise amusement park (named "Nice Land") will locate in Shanghai, China, is 0.7, the probability that it will locate in Beijing, China, is 0.4, and the probability that it will locate in {either Shanghai or Beijing} is 0.8. :

a)If it is known that a Nice Land will locate in Beijing, what is the probability another nice land will also locate in Shanghai?

b)Are two events ({a Nice Land will locate in Beijing } and {a Nice Land will located in Shanghai} independent or not? Why?