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1 kg - x
0.30x = 3.60
x= 12 zł
0.40kg - 2.40
1 kg - x
0.40x = 2.40
x = 6 zł
1kg - x
3,6 ÷ 0,3 = 12zł
0,4kg - 2,4zł
1kg - x
2,4 ÷ 0,4 = 6zł
0,3/0,3=1
3,6/0,3=12
1kg za 12
0.40 za 2.40
0,4/0,4=1
2,4/0,4=6
1kg za 6