Locate a recent SMRB or MRI publication in your library, and select a product large numbers of consumers use (soft drinks, cereal, candy bars, etc.). Pick out the index numbers for the 18-24, 25-34, 35-44, 45-54, 55-64, and 65 and older age categories. Show how the index numbers were calculated. Also, identify some magazines that would be especially suitable for advertising to the heavy users of your selected category.