What is the average sales of all the branches (in thousands numbers) for the years 2000?

Answer: Option B

Total sales of all the six branches (in thousand numbers) for the year 2000
= 80 + 75 + 95 + 85 + 75 + 70
= 480
Average sales of all the six branches (in thousand numbers) for the year 2000
$$\begin{array}{rl}& =\frac{480}{6}\\ & =80\end{array}$$