Answer
0.046 kWh
6.6 cents/month
Work Step by Step
Multiply the kilowatts of power by the number of hours to find the energy in kWh.
Energy = $(0.550\;kW)(5.0min)\frac{1h}{60min}=0.046 kWh$.
Now find the cost to use the toaster per month.
Cost = $\frac{0.046 kWh}{day}\frac{4d}{1week}\frac{4 weeks}{1month}\frac{9.0cents}{kWh}=6.6\frac{cents}{month}$.
