The following table shows the total number of votes polled and percentage of invalid votes for a village.
| Year | Total votes | Invalid votes |
| 1980 | 6500 | 5% |
| 1985 | 8000 | 7% |
| 1990 | 9200 | 10% |
| 1995 | 10400 | 12% |
What is the number of valid votes polled in 1985?
1
5600
2
7440
3
6425
4
7140