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x-100%
x= 900x100/80= 90x 100/8= 9000/8= 1125 zl
Odp.: Cena pierwotna to 1125zł
x zl ------> 100%
x= 900x100/80= 90x 100/8= 9000/8= 1125 zl
Odp.: Cena piereotna wynosila 1125 zl.