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r----- roczna stopa
K₀=3000
K₂=6000
K₂=K₀(1+r)²
6000=3000(1+r)²=> r=-1√2
r=≥0
r=√2-1≈41%
41% --- wynik
K2=K0(1+r)2 6000=3000(1+r)2 => r= −1−√2 (sprzeczne, bo r≥0) lub r= √2−1 ≈ 41%
41% --- wynik