The bar graph below shows the sale of books (in thousands) has been given in two consecutive years of 2010 and 2011 of five branches of a publishing company. Find the ratio of total sales in the two years of branch C2 to the sales in both years of branch C4 ?

85 : 76 

Total sale of C2  :  Total sale of C4

    ( 79 + 91 )    :     ( 66 + 86 )

          170         :        152

           85          :          76