In my own opinion, a $50 capital might be enough if you invest it in bitcoin because investing in bitcoin is risky, but it is profitable. As long you can manage your portfolio and make a successful trade you could earn good profit.
You must be joking. The risk -reward ratio is good with Bitcoin but with $50 there's no risk so there will also be no reward.
What can you expect? To make another 100% in a year if you're lucky? That will make you own a whopping $100 by the end of the year. Congratulations!