The pie chart given below shows the number of bike sold by 8 different companies. The total number of bike sold by all these 8 companies are 2000. Number of bikes sold by a particular company is shown as a percent of total number of bike sold by all these 8 companies.

What is the difference between the average number of bikes sold by P, Q, R and S and the average number of bikes sold by T, U, V and W?