Listed below are the net sales for a San Francisco€“area mail-order retailer for the years 2003 to 2012. Use the mean sales for the earliest three years to determine a base and then find the index for 2011 and 2012. By how much have net sales increased from the baseperiod?

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Year Sales (millions) 2003 2004 2005 2006 2007 $486.6 506.8 522.2 574.6 580.7 2008 2009 2010 2011 2012 Sales (millions) $568.5 581.9 496.1 456.6 433.3