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0,49-----1,12zł
0,50-----x zł
x=1,14zł => tyle należy zapłacić
51% - 1,12 zl
x = 2,19 zl
100% 2,19zl
50 % x
x = 50% x 2,19 : 100
x = 1,1
50% -1,15 zł
odp: 1,15 zł