The following bar graph shows the sales (in thousands) of books from six different branches of a publishing company in 2000 and 2001.

Answer the following question based on the bar graph:

What is the ratio of the total sales of C3 for both years to the total sales of C4 for both years?

14 : 15

Total sale of C3  :  Total sale of C4

  (110 + 100)     :    (115 + 110)

         210          :        225

          14           :         15