I am glad you posted that. Here is what I found:
Table: French Income Tax Bands - 2012 Income Share Tax Rate
Up to €5,963 0%
Between €5,964 - €11,896 5.5%
Between €11,897 - €26,420 14%
Between €26,421 - €70,830 30%
Above €70,830 41%
Now do the math. You make 25k a year and you work hard...