Direction: Study the following bar graph and answer the question based on it.
The sales of books (in thousands) of five branches (C1, C2, C3, C4 and C5) of a publishing company in two consecutive years 2010 and 2011 are given.
Find the average sales (in thousands) of all the companies in the year 2010?
1
71
2
72
3
70
4
73