The following table shows the weight (in kg) of vegetables sold by 6 different shops. It also shows the weight (in kg) oftomatoes sold out of the total vegetables sold by each of these shops.
| Shops | Vegetables (in kg) | Tomatoes (in kg) |
| S1 | 5000 | 1200 |
| S2 | 6000 | 1000 |
| S3 | 4800 | 800 |
| S4 | 6400 | 1400 |
| S5 | 5600 | 1800 |
| S6 | 6800 | 2000 |
Taking shops S1, S2 and S5 together, approximately what percentage of all vegetables sold, from these three shops taken together, are tomatoes?