The following line bar graph shows the sales (in thousand numbers) of scooters from six different companies in 2011 and 2012.
What is the ratio of the total sales of company C for both the years to the total sales of company D for both the years?
1
2 ∶ 3
2
3 ∶ 2
3
11 ∶ 13
4
29 ∶ 36