The adjoining bar graph shows the numbers of book sold by a bookstore during 5 consecutive years. Read the bar graph and answer the following question: About how many books were sold in 2008,2009 and 2011 years?
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Solution
Books sold in 2008=120
Books sold in 2009=320
Books sold in 2011=200
Books were sold in 2008,2009 and 2011 years=120+320+200=640