The following table shows worldwide sales of a certain type of cell phone and their average selling prices in 2012 and 2013. Year 2012 2013 Selling Price ($) 395 335 Sales (millions) 751 1,087 (a) Use the data to obtain a linear demand function for this type of cell phone. (Let p be the price, and let q be the demand). qlp) = Use your demand equation to predict sales if the price is lowered to $215. million phones (b) Fill in the blank. million units. For every $1 increase in price, sales of this type of cell phone decrease by

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