Citigroup, Inc., is a major financial services company based in New York. It suffered huge losses during the global financial crisis and was rescued in November 2008 in a massive bailout by the U.S. government. Consider the following table, representing the net revenue and net income of Citigroup for 2006 to 2009. Both variables are measured in billions of dollars.

a. Compute and interpret the simple price index for net revenue, using 2006 as the base year.
b. Compute and interpret the simple price index for net income, using 2006 as the base year?

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Net Income Year 2006 2007 2008 Net Revenue 146.6 159.2 105.8 1110 21.2 3.6 -277 1.6