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a2=a+20%a=a+0,2a=1,2a
P2=(1,2a)^2V3=1,44a^2V3
P2-P1=1,44a^2V3-a^2V3=0,44a^2V3
100%*0,44a^2V3/a^2V3=100%*0,44=44% pole wzrosło o 44%