The pie chart given below shows the number of cars sold by 8 different companies. The total number of cars sold by all these 8 companies are 2,000. Number of cars sold by a particular company is shown as a percent of total number of cars sold by all these 8 companies.

The average number of cars sold by C1 and C2 is how much percent less than the average number of cars sold by C7 and C8?

A

66.66 percent

B

33.33 percent

C

16.66 percent

D

25 percent