x-cena towaru
1x+0,05x+100=x+190
1,05x+100=x+190
0,05x=90 /*100
5x=9000/:5
x=1800zł - stara cena
x=1800zł+190zł=1990zł - nowa cena
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x-cena towaru
1x+0,05x+100=x+190
1,05x+100=x+190
0,05x=90 /*100
5x=9000/:5
x=1800zł - stara cena
x=1800zł+190zł=1990zł - nowa cena