Well due to how complicated trading is, it wouldn't be fair if I give you a direct answer because everyone don't have the same level of greed, you know that we are all humans and we all have our different troubles and financial needs, and I believe that it's one of the reasons that makes us to be greedy at some point, that instead of running away with our gains, we will be wanting more, and in the process we lose all our gains and even our capital sometimes, so It wouldn't be ok if I just give you a direct answer, because in as much as 10 dollar daily will be very much ok for me, it wouldn't be that ok to most people, because 10 dollar in most countries is just too small, while in some countries, it's huge, so your daily target depends on many factors.
Someone trading and thinking of making money for financial needs is not good at all. Someone should trade because he has time to trade but the person should earn from other places and not depend on trading. Money can be made from trading but trading is very risky. Which is the reason we should not see it that way.
So to answer your question, I would say to you that it should be determine by your level, which I don't know, because 10 to 20 dollar daily might be enough for me, but it might not be enough to you, due to your location, so it's all depends on your location and your level of greed.
I asked if percentage and not the exact money because I want to know the extent of risks some traders can go.