This is not a surprise, this extra money is effectively bringing the employee health insurance, pension, invalidity pension, unemployment benefit, maximum number of hours to work per week, paid vacations, etc.

If you need to pay it out of your pocket, it turns out to be the same.

In the "old" Europe, the net salary is basically 50% of the cost for the company, sometimes a bit more, sometimes less depending of marital status, country, etc. But this is a good rule of thumb.