The ratio of total sales by all branches for the year 2001 to total sales by all branches for the year 2000 is:

As Given in above Bar Graph

Total sales in 2001 = sum of sales of all companies in 2001

$$\Rightarrow$$ Total sales in 2001 = 105 + 65 + 110 + 95 +95 + 80

$$\Rightarrow$$ Total sales in 2001 = 550

Total sales in 2000 = sum of sales of all companies in 2000

$$\Rightarrow$$ Total sales in 2000 = 80 + 75 + 95 + 85 + 75 + 70

$$\Rightarrow$$ Total sales in 2000 = 480

Required Ratio $$\Rightarrow 550 : 480 \Rightarrow 55:48$$