Toyota Motor Corp., once considered a company synonymous with reliability and customer satisfaction, has been engulfed in a perfect storm with millions of cars recalled (BBC News, March 19, 2010). The following table shows the monthly adjusted closing price per share of Toyota from October 2009 to March 2010.

a. Form a simple price index with October 2009 as the base.
b. Update the simple price index, using January 2010 as the base.
c. What is the percentage price change from October 2009 to December 2009?
d. What is the percentage price change from January 2010 to March 2010?

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Adjusted Closing Price Date Adjusted Closing Price Date October 2009 November 2009 December 2009 78.89 January 20107700 74.83 84.16 March 2010 79.56