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4,5% - 270
100% - x
27000/4,5=x
x=6000 - zysk 270 zl
4,5% - 900
100% - x
90000/4,5=x
x=20000 - zysk 900 zl
x=0,045
4,5%
0,045x=270 |:0,045
x=6000
0,045=900 |:0,045
x=20000