Please buy your money with an altcoin that has just finished ICO and is only traded in the exchange. Because usually the price is definitely going down dramatically, for example, please buy IMT tokens
Well, I think that is a best suggestion because with 100 dollars you can really make a lot of cash with trading if you are smart enough, have watched a video on youtube tagged as '' How I make $1000 everyday trading cryptocoins'' by crypto oracle if maybe you join the forum it might really helped.