I want to buy different types of alt coins and not just one.
I will use half for short term trading and other half as long term investment.
What will the value of this 300 USD become in 2020 ?
Thanks for your time and replies.
Have a good day

This will depend on how you are determine for that matter. And it is nice and better to use half of your investment in trading. And my suggestion to you it is much better for to invest in bitcoin, or some legit altcoins that has established big community in crypto world.
And by 2020, no one knows, it might our investment become double, trpple, or more by that time.