this is a question about blackberry mobile (price) change?

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worldSHcup

New member
hello, i have this case study to do in economics... i am supposed to find out the change in price for black berry mobile (any model; onyx or bold or curve) since year 2009 until now. also, i need to know how these price changes have affected the number of purchase. it's best if you could give it to me in numerical data monthly. for example;
january 2009- 2.3 million (1million purchase made this month)
febuary 2009- 2.2 million (2 million purchase made this month)

thanks in advance and god bless all those who shall help me!
 
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