the winning percentage of this EA. I would like to make 2 statements, both of them equally important for saving your money.
1. Trading is an individual skill. What works for some traders may not work for others. That is why you see so many trading strategies on forex sites like FF and so many arguing discussions about their results.
2. If someone/anyone is trying to sell you a certain forex product and guarantees for a precise winning percentage or amount of money (earnings), turn around and run away. It is most likely a scam.