You can guarantee a random 10% of the world population all basic human needs, but you have to sacrifice a finger every time you make that deal; how many people will you help?

The 10% stacks additively, each time you do the deal, this status is applied to a different 10%. If you sacrifice 10 fingers, the entire world is guaranteed basic human needs (food, water, shelter, clothing, healthcate, etc...)

Nobody knows you saved them. Would you do it?

If everyone knows about the fact that you can do this deal, would that change your mind?