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He won't have given away 70% of his wealth. If he gave away a dollar at the beginning that is 10 dollars that dollar didn't turn into etc.



AFAIK he didn't give it all away in one lump sum at the start.


First giving away X% and then getting a Y% return on investment has exactly the same effect on his wealth as first getting a Y% return and then giving away X%.

So to determine X, we can just ask how much money he’d have now had he not given any away, and it looks like he has about 70% less than that.




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