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8*10m=80m2
10% - 80m2
100% - x
10x= 8000 /:10
x=800m2
x - powierzchnia działki
80=10%x
80=0,1x |:0,1
x=800m²
Odp. Powierzchnia działki wynosi 800m²
80=10%
80*10=800 m ;]