2,10/12=0,175 zł/szt
2,10/15=0,14zł/szt
0,175=100%
0,14=x
x=(0,14*100%)/0,175
x=80%
odp. o 20%
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2,10/12=0,175 zł/szt
2,10/15=0,14zł/szt
0,175=100%
0,14=x
x=(0,14*100%)/0,175
x=80%
odp. o 20%