Problem: Reread this paragraph from the section called "Product Placement." Identify the number of the sentence that states the main idea.
"How effective is product placement? The research company Arbitron surveyed moviegoers as they left theaters and found that 80 percent remembered ads shown at the beginning of the movie.
Other media aren't close, recently spurring a 37 percent increase in movie ad revenue to $356 million in one year. *Also, according to Arbitron, the notion that most people resent ads is mythical. Of viewers between ages 12 and 24, 70 percent weren't bothered by the ads.