hi ray, thanks for putting up with our questions!
so for a 2nd year pre-experienced bachelor i pieced together the following:
13 months*4,2k€=54,6 brut x 0,76 (=24%tax)= 41,5k net
+
180 per diems x 100€ *0,9 (the 10,55% social)= 16,2K
+
Night & Sunday 10,5 months (rest=vacation)*500*0,9 (social)= 4,725
grand total per year == 62,4 net :12= 5,2 per month