When McDonald's entered Denmark, they tried to be non-union. That didn't work out for them, and by 1989 they entered agreements to work with the union. See http://www.remappingdebate.org/article/high-road-high-wages-... for some of that history.
The lowest paying union job in Denmark is just under US$20/hour. Figure 1550 hours per year (the Danish average) gives US$31,000. The article I referenced uses "full-time equivalent", which is likely a 2000 hour measure, or US$40,000.
My estimate sets the baseline, but the actual wages might be higher. The article I mentioned quotes $45K/year, and links to a McDonald's document .. which is in Danish, and I don't know Danish.
> a Big Mac extra value meal costs 58 kroner, or $10.25, while the Dollar Menu is the 10 kroner menu, which means it’s the dollar-seventy-seven menu here. In Denmark, taxes are included in list prices, unlike in the US, so backing out the 25 percent VAT gives us $8.20 for a Big Mac meal and $1.41 for the “dollar” menu. That compares to $6 and $1 in Seattle.
(It's not quite right to compare VAT and sales tax, but so be it.)
Edit: reading the link, I guess this is in reference to what workers at a McDonald's in Denmark make.