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P=100m*78m
P=7800m²
7800m²:10m²=780
780*350g=273000g=27300dag=273kg
odp.pan Żwirski potrzebuje 273kg nawozu
7800 m2 : 10 m2 = 780
780 x 350 g = 273 000 g = 273 kg