A company manufacturing CDs is working on a new technology. A random sample of 618 intemet users were asked: "As you may know, some CDs are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even if it was one you would normally buy?" Of these users, 69% responded that they would buy the CD. Complete parts a and b below. b) If the company wants to cut the margin of error in half, houlmany users must they survey? The company must survey a total of users. (Type a whole number.)