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35dag------5,46 zł
100dag------x
x=5,46zł*100dag / 35dag
x=15,6 zł
B)
30dag------7,44zł
40dag-----x
x=7,44zł*40dag / 30dag
x=9,92 zł
1kg - x zł
x=1*5,46/0,35
x=15,69zł
b)0,3kg - 7,44zł
0,4kg - x zł
x=0,4*7,44/0,3
x=9,92zł