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It is estimated that, from the beginning of 1995 to the end of 1999, the average number of CDs bought by teenagers increased from 5 per year to 9 per year. During the same time period, the average number of videogames purchased by teen- agers increased from 2 per year to 10 per year. Assuming that in each case the consumption rates are the same, in what year did teenagers buy the same average number of CDs and videogames?
The correct answer is D.
The best way to solve this problem is to set up a table indicating the time period in years, and the number of both CDs and videogames purchased during the years given. The consumption rate is the same, so, based on information in the problem, you can fill in the table as follows:
Teenagers bought the same average number of CDs and videogames in 1998.