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The music industry in the United States has had a great deal of fluctuation in profit over the past 20 years due to the advent of new technologies such as peer-to-peer file sharing and mobile devices such as the iPod and iPhone. The following graph displays data from a report published by eMarketer in 2009 about the amount U.S. consumers spend on digital music files and physical music formats (CDs, records, cassette tapes, etc.), where the values for 2009–2013 are reported as projections and for 2008 is reported using actual U.S. spending measurements.
- a. According to the study, when will the sale of physical media be equivalent to the sale of digital audio files?
- b. When will the sales of digital audio files exceed that of physical media by $1 billion?
- c. If the physical media sales were $2 billion higher than the trend displayed on the graph, when would the sale of digital audio files exceed physical media?
- d. If the digital audio file sales were $1 billion lower than the trend displayed on the graph, when would the sale of digital audio files exceed physical media?

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