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100% = 1
120% = 1,2
P₁ = π * (1 * r)²
P₁ = πr²
P₂ = π * (1,2 * r)²
P₂ = 1,44πr²
1,44πr² - πr² = πr² * (1,44 - 1) = 0,44
0,44 = 44%
Odp: o 44%