How does 27.56% and 4.32% come???

Provision 5.B.2.d Firms should present annualized composite and benchmark returns for periods longer than 12 months 2008 209 2010 2011 2012 2n to sep Period Jan to Sep Composite return %10.3-24.8 8.2 6.1 10.8 20.9 What is the cumulative return from 1 Jan 2008 to Sept 2013? You should get 27.56% What is the annualized return from 1 Jan 2008 to Sept 2013? You should get 432%