The bar graph below shows the sale of books (in thousand) 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 total sales in both years of branch C4?
1
76 ∶ 85
2
169 ∶ 153
3
153 ∶ 169
4
85 ∶ 76