If I have 0$ at the moment can I make 100$ in 2 or 3 months? How?
What if I deposited 20$ .. Can I make them 100$ in less time?
You can earn more than that by participating in some good ICO projects. If you are a good foreign language, join the translate bounty campaign to earn more than $ 2k per project. Or if you are not good at foreign languages, you can participate in signature campaigns for a salary of over $ 1k per project. That is my average salary and I hope you get that salary.
Yes, you can make it even on Bounty projects. I do not think that investing in any ICO is the variant for the author of this thread. The guy was interested how to make 100 dollars without initial money.