R$239.50 or $74. That's 25% the minimum wage here in Brazil.
This means that this congressman was paying for someone else's meal, which is in itself an act of corruption.
And even if that's not the case, most Brazilians can't afford a 40 BRL meal on a regular basis, so why should a politician be able to do so with our money?
If you dig deeper into other reports, you can also see congresspeople spending public money in sex shops and clubs, for instance (https://twitter.com/cuducos/status/840882495868530688).