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t = 3 min = 3/60 h bo 1 h = 60 min
W = ?
1 kWh = 0,60 zł ; zakładam, że tyle kosztuje 1 kWh
P = W /t
W = P * t
W = 1 kW * 3/60 h
W = 0,05 kWh
1 kWh = 0,6 zł
0,05 kWh = x
x = 0,03 zł