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21dag (0,21kg) serdelków - 6,80zl /kg
0,25 kg pasztetu - 7,50 zl/kg
0,17*21+0,21*6,80+0,25*7,50=3,57+1,428+1,875=6,873≈6,87zł
0,21*6,80=1,43
0,25*7,50=1,87
3,57+1,43+1,87=6,87
odp 6,87zł