[Avodah] 20% max? re: obligations to poor/pikuach nefesh ....

[Harvey Benton]

Does giving to the poor or those in dire need (eg saving one from death at hands 
of nzis/ or other pikuach nefesh situations require or allow us to give more 
than the 20% of our income to the poor? 
acc to website: http://waterburyyeshiva.org/highlights/page/5/
if someone is in front of  you, takanos usha (kesubos 50a) wouldn't apply 
(see Ahavas Chesed 2:20:2, Birchai Yosef 249:1), and therefore one would be 
allowed to give more 

what if they are not in front of you? 
what if one hears of people in trouble in other parts of the world (eg, wwii nzi 
situation) is one required/allowed to sell off assets or give more, in order to 
save jews? (what about non-jews, rawanda, etc??)
hb
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