Original sentence: ) costs nearly $20,000.A 30-second commercial in prime time (after 8 p.GRP (short for Gross Rating Point) is the sum of ratings achieved by a specific media vehicle or schedule.If the advertisement appears more than once, the GRP figure represents the sum of each individual GRP.In the case of a TV advertisement that is aired 5 times reaching 50% of the target audience, it would have 250 GRP = 5 x 50% -- ie, GRPs =  frequency x % reach.It represents the percentage of the target audience reached by an advertisement
Edited sentence: For example, a TV advertisement that is aired 5 times reaching 50% of the target audience, it would have 250 GRP = 5 x 50% -- ie, GRPs =  frequency x % reach.GRP (short for Gross Rating Point) is an acronym used in advertising to measure the size of an audience reached by a specific media vehicle or schedule.It's the product of the percentage of the target audience reached by an [[advertisement, times the frequency they see it in a given campaign