Most of the the time, those project that gives hope with fast ROI and big gains in a short period of time are mostly scam. Never ever trust those projects otherwise you may end up losing a lot of money. And also regarding the percentage its fine even if you put half of your money as long as you know and you already research and well known creator are founder.
Don't invest in any project without you knowing the details of the project especially make sure the team must be valid and not anonymous, control the emotions not to rush to invest your assets but have to test the feasibility of developing the project in a month, it will complete the analysis before making a mistake in investing.