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T=20min=(1/3)h
k=0,90zł/kWh
K=?
========================================
W=P*t=1200*(1/3)=400 [W*h=Wh]
400Wh=0,4kWh
K=W*k=0,4*0,90=0,36 [kWh*zł/kWh=zł]
koszt energii wynosi 36 gr.