Here is some information about a professor salary index (PSI) Year PSI Change in PSI 2004 82 3.22% 2005 89 8.50 2006 100 a 2007 b 4.00 2008 107 c 2009 116 d 2010 e 5.17 2011 132 7.58 A) Calculate the unknown quantities a,b,c,d,e in the table . B) What is the base year of the PSI? how did you determine it? C)Given the data PSI , calculate the average annual price increase in salaries paid to professors for between 2004 and 2008 and between 2006 and 2011 .