Yep, they are a tad bit on the "extreme", but not that much off, if you asked me, I would have answered, from personal knowledge (these are "net" income, i.e. with income tax already paid):
shop assistant: 1,000-1,100 Euro/month but for 13 months of wage[0]
web designer[1]: 1,800-2,200 Euro/month but for 11 months of work only
[0] the 13th month wage is only part of the full month wage, but for low pays, like 1,000-1,100 it is a large part, probably 850-950 Euro
[1] maybe you are misguided on the definition of web designer, here in Italy that generally (but not always) means "a self-educated programmer that makes a somewhat basic living doing a few very small company sites at 500-2,000 Euro each and, if he/she is good, maybe has a handful of yearly contracts to maintain them, at 100-200 each per month".
shop assistant: 1,000-1,100 Euro/month but for 13 months of wage[0]
web designer[1]: 1,800-2,200 Euro/month but for 11 months of work only
[0] the 13th month wage is only part of the full month wage, but for low pays, like 1,000-1,100 it is a large part, probably 850-950 Euro
[1] maybe you are misguided on the definition of web designer, here in Italy that generally (but not always) means "a self-educated programmer that makes a somewhat basic living doing a few very small company sites at 500-2,000 Euro each and, if he/she is good, maybe has a handful of yearly contracts to maintain them, at 100-200 each per month".