 Let's say the ad appeared in each of four television programs (A, B, C, D), and each program has a 20 rating, resulting in a total of 80 gross rating points.It is possible that some viewers will see more than one announcement—some viewers of program A might also see program B, C, or D, or any combination of them.For example, in a population of 100 TV homes, a total of 40 are exposed to one or more TV programs.