10kg str.................12 kgpere.......=153.70 lei
5kg str....................7kgpere..........=82.20 lei |x2
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10kg str..............12 kg pere............=153.70 lei
10kg str...............14 kg pere..........=164.40 lei
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2 kg pere..........=10.70 lei
10.70 :2=5.35 lei /kg pere
5.35 x 12=64.20
153.70 - 64.20 =89.50 lei /10 kg str
89.50 :10 = 8,95 lei/kg str