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Dane:
c = 0,9a
d = 1,2b
P₁ = ab
P₂ = cd
P₂ = 0,9a*1,2b
P₂ = 1,08ab
P₁/P₂ *100% = ab/1,08ab*100% = 92,6%
P₂/P₁*100% = 1,08ab/ab*100% = 108%