Demand for Cell Phones The following table shows worldwide sales of cell phones by Nokia and their average wholesale prices in the first quarters of 2009 and 2010:
a. Use the data to obtain a linear demand function for (Nokia) cell phones, and use your demand equation to predict sales if Nokia lowered the price further to $75.
b. Fill in the blanks: For every ____ increase in price, sales of cell phones decrease by ___ units.
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