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P2=0,8a*b=0,8ab
ab-0,8ab=0,2ab
ab--------100%
0,2ab----------x%
20ab=xab
20%
odp.:20%
P=(a-20%a)*b
P=0,8a*b
a*b -100%
(a-20%) -x%
a*b -100%
0,8 -x%
x= 0,2
pole będzie się zmieniało o 20%