because of new technologies the price for mp3 players had decreased from $150 to $80 as a result demand for mp3 players increased from 100 to 500 for December
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End of the iPod Era Apple introduced the first iPod in October 2001. Sales of the portable music player grew slowly in the early years but began to grow rapidly after 2005. But the iPod era is coming to a close. Smartphones with music and video players are replacing the iPod, along with the category of device it helped to create. Sales of the iPod worldwide from 2007 through 2011 (in millions) were approximately $$N(t)=-2.65 t^{2}+13.13 t+39.9 \qquad(0 \leq t \leq 4)$$ in year $t,$ where $t=0$ corresponds to 2007. Show that the worldwide sales of the iPod peaked sometime in 2009. What was the approximate largest number of iPods sold worldwide from 2007 through 2011?
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