Study the given bar-graph and answer the question that follows.
The bar-graph shows the sales of books (in thousands) from six branches (B1, B2, B3, B4, B5 and B6) of a publishing
What is the ratio of the total sales of branch B2 for both years to the total sales of branch B4 for both years?
1
6 : 7
2
7 : 9
3
2 : 3
4
3 : 5