A store has a $9000 monthly advertising budget. Newspaper ads cost $600 each with a limit of 30 per month, radio ads cost $30 each with a limit of 60 per month, and TV ads cost $3000 each with a limit of 20 per month. About 4000 people see each newspaper ad, 3000 hear each radio ad, and 12,000 see each TV ad. How much of each type should be used to maximize the store's exposure? Interpret the results.
If the store wants to maximize exposure, it should use newspaper ads, radio ads, and TV ads.