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Unfortunately there's no easy answer, because it depends how much you are willing to risk. Day Trading is a function of risk and reward: The more you risk, the more you can make. Here's an easy example: Let's say you start with a $5,000 account and you're willing to risk $1,000. Now you could place a trade to go long at the opening, set a profit goal of $1,000 and a stop loss of $1,000. Let's say you investigated the market behavior in the past couple of months and realized that your chances of achieving your profit goal are 60%.
Unfortunately the trade you just placed is a loser, and you lose the whole $1,000. Since this was the amount you were wiling to risk, you close your account, transfer the remaining $4,000 back in to your checking account and that's it for you. Now let's assume you wanted to risk only $100 per trade and you adjusted your profit goal to $100, too. Now you can make at least 10 trades, because only if all 10 trades are losers you'll lose the $1,000 you are willing to risk. I don't want to become too mathematical, but statistics says that the probability of having 10 losing trades in a row is less than 1%. Therefore it's highly likely that you will have a couple of winners within the 10 trades. If your trading system shows the same performance as it did in the past (60% winning percentage), you should make $200: 4 losing trades * $100 = -$400 + 6 winning trades * $100 = $600. Make sense?