Answer:
The thing advertising sales can tell us about the state of various types of media is:
Advertising sales can tell us how well a type of media is doing—if ad sales are high, then the media is doing well.
Step-by-step explanation:
Advertising sales (or ad sales) are the sales of media spaces for advertising purposes. Organizations create awareness of their products and services by buying media spaces. The proceeds from an advertising business are known as Advertising Sales. The business is usually conducted by Advertising agencies and representatives of media houses.