there are two different questions, plz show the formula

QUESTION 1 Consider the following realized annual returns: Index Realised Return Stock A Realised Return Year End 23.6 46.3 2000 24.7 26.7 2001 30.5 86.9 2002 9.0 23.1 2003 0.2 2.0 2004 17.3 3.2 2005 24.3 27.0 2006 32.2 2007 4.4 5.1 2008 11.3 2009 The average annual return on the Index from 2000 to 2009 is closest to