You live in a fantasy world, 100% of funds cannot go to the Tzadeak unless its a very small charity with only 1 or 2 people involved, no offices , no phones etc
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With Verizon for $68.86 a month (tax included) you can make unlimited phone calls to every state in USA + Canada + High Speed Internet. It will cover all day long calls and tons of e-mails. Today big corporations send employees to home offices and cut off corporate expenses on office. I can’t see why someone can’t collect tzedakah from home.