An example calculation would look something like this:
400,000 Euro loan
==> 1% repayment = 4,000 Euro
==> 2% interest = 8,000 Euro
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= 12,000 Euro / year ==> 1,000 Euro / month
1,000 Euro / month = 30% of net income ==> 3,333 Euro / month net income
with 2% repayment it would be 1,333 Euro / month
In addition to repayment and interest, there are additional costs, electricity, and definitely personal reserves for car, household purchases, etc.
Then you don’t know how many people have to live off the rest.
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If it were only a 200,000 Euro loan, all other amounts would also be halved .. including the net income.