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You are a share analyst for an investment firm and are investigating the return on shares in the Eastern Mining Corporation over the last four years. The return on Eastern Mining Corporation shares over the last four years is presented.

Calculate the geometric mean rate of return (R) on Eastern Mining Corporation shares over the last four years. Give your answer as a percentage per annum to 2 decimal places.

R = % pa

Return on Eastern Mining Corporation shares

Year Return

2009 44%

2008 17%

2007 -11%

2006 19%