The Decline Of Justin Bieber

Calculus Level 3

Suppose that in January 2013, there were 5000 radio stations in the US that played Justin Bieber's music, and that In July 2013, there were only 4000 radio stations in the US that played Justin Bieber's music.

Assuming that the rate of decline is proportional to the number of radio stations which play Justin Bieber's music, when would there only be 2000 radio stations which play Justin Bieber's music?

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