To answer your rent/school question -
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For our family, yes, 42% of our income would be way too much to spend on rent and school alone. But here's the thing - and I didn't see your original post - I really think it depends on WHAT your actual income is.
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I mean, if you're bringing home $1,000/mo and $420 of that is going to those 2 expenses alone, you're probably in trouble.
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However, if you are bringing home $5,000/mo, you're still left with $2900 for everything else, which would probably cover you easily. See what I'm saying?
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Either way, though, I wouldn't be comfortable paying that much - whatever my income. The 25% on rent seems reasonable, though.