I have earned about the same in interest as my actual profit on this trade. I actually was in the loss for majority of this trade. At one point I was near -450 and only 8% margin left. Eventually the stock came around as I expected but took longer than I hoped. This trade was a test, as I never executed a trade on this platform before. I have exited the trade using my mobile. I will attempt to stay above 25% Margin in future trades. I have earned about 18% return.