A merchant surveyed 350 people to determine the way they learned about an upcoming sale. The survey showed that 170 learned about the sale from the radio, 160 from television, 160 from the newspaper, 80 from radio and television, 100 from radio and newspapers, 80 from television and newspapers, and 50 from all three sources. How many people learned of the sale from newspapers or radio, but not both? people learned of the sale from newspapers or radio, but not both