The following table shows the sale of 2-wheeler and 4-wheeler in units during 2010 to 2014.
| Year | 2-wheeler | 4-wheeler |
| 2010 | 4200 | 1080 |
| 2011 | 5350 | 1200 |
| 2012 | 5800 | 1340 |
| 2013 | 5250 | 1550 |
| 2014 | 5500 | 1130 |
Find the difference between the average sales of 2-wheeler and 4-wheeler for the given periods.
1
3600
2
3960
3
3440
4
3820