A remote village receives radio broadcasts from two radio stations, a news station and a music station. Of the listeners who are tuned to the news station, 60% will remain listening to the news after the station break that occurs each half hour, while 40% will switch to the music station at the station break. Of the listeners who are tuned to the music station, 50% will switch to the news station at the station break, while 50% will remain listening to the music. Suppose everyone is listening to the news at 8:15 A. M. Complete parts a through c.