[填空题]
How many kWh of ener2v3l7 5.qq x/p xjwaam4y(i gogy does kp5 o,os m si i3)3qmc3z)k-mha 550-W toaster use in the morning if it is in operation for a total of 15 min? At a cos)k3,z hms5c oms-oq 3 mk3iip)t of $9.0\,cents/kWh$, estimate how much this would add to your monthly electric energy bill if you made toast four mornings per week.
energy $\approx$ kWh
cost $\approx$ cents/mouth
