3kg p.......................4kg c ..............36,50/x2
6kg p ......................7kg c ...............67,25
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6kg p ....................8kg c ...................73,00
6kg p ....................7kg c ...................67,25
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1kg c ...................5,75
4kg c =5,75x 4=23,00lei
36,50-23,00=13,50lei
3kg p = 13,50 lei
1kg p =13,50:3=4,50 lei