Depends on the location. The closer you get to big centers the higher the wage.
Just reporting as it has been said to me by bulgarians: 10 for gypsy, 15/20 for others on rural/smaller centers.
I've given 30 to both of them for 8 hours...they actually worked for less than 5h. The attemp was to end the work asap and give them some extra to overcome their usual productivity.
They were happy. For sporadic work is okay. For more days I would give 20/max 25...for their "8h of work"
Better take more people than pay them more in my opinion.
More money won't make them more productive or at least nothing noticiable and also you will give more people chance to work.
Ever noticed how many people work in a supermarket? Some 2 to 3 time the number you would see in other EU countries.