Usually, I don’t set my profit that low because it doesn’t make much sense if I have to pay 0.25 percent market fee. Like you said, if you entered the market with 3800 usd which market fee is 0.1 percent leaving you with balance of 3796 usd to trade with. If you are to take 0.3 percent profit completely, it means you must first add the market selling fee of 0.15 percent, so total increase you must attain before you can sell is 0.45 percent of your balance. That is 0.45% of 3796 which is 17.1 usd.

Hence, total amount you can get to before selling to attain the 0.3% profit should be 3813.082. So you are talking about 13 usd increase on your initial capital.