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 actually earn more than that specially if you are skilled and fully determined enough. Through joining such sigmature campign, bounty program, and other service which is offered in this forum, you can earn more than $100 in less than or more than a month. If your target is 2-3 months, it's quite tangible without any investments.