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68-6,8=61,2
61,2*0,2=12,24
61,2-12,24=48,96
68 zl- 6,8zl= 61,2 zl
61,2 zł × 20%= 12,24 zl
61,2zl-12,24zl= 48,96 zł
odp: bluzka po obu obnizkach kosztuje 48,96 zl
61,2-(61,2*0,2)=48,96 zł