Formuller

6=0.40x4-2.75-5.50,0.50x4-2.75-5.50,0.50x6-2.75-5.50,0.60x4-2.75-5.50,0.60x6-2.75-5.50 8=0.50x6-2.75-5.50,0.60x6-2.75-5.50,0.70x6-2.75-5.50 12=0.50x6-3.10-5.80,0.50x7-3.10-5.80,0.60x6-3.10-5.80,0.60x7-3.10-5.80,0.70x6-3.10-5.80,0.70x7-3.10-5.80