Study the following chart carefully and answer the questions.
The bar chart shows information about the sale figures of the wrist watches from five branches A1, A2, A3, A4 & A5, of a company "ABC" in 2016 and 2017.
What is the difference between total sales of all branches for the year 2016 and the year 2017 (in crores)?
1
5
2
10
3
15
4
20