If you only have $ 50 then this means you have no money. In such circumstances, I do not advise you to deal with the investments in altcoins. It is very risky. Can invest in bitcoin. You earn a lot of speculation, but the price of bitcoin will rise in the future and that you will make sure. In any case you decide.
Investing $50 in bitcoins? Are you serious? And with current rate with that capital he will get 0.023 btc which is too low to hold and even if price goes higher in future you won't be making huge profits from it so better choice would be to invest in altcoins with low price and wait for them to go higher in coming time period.