[填空题]
How many kWh of energy does a 550-W toaster use in the morning i5b-qb ljz,(cfos)go 3)f: t7;bbc r iwf it is in +,0p) vr xy*,mnhsslb operation for a total of 15 min? At a cost nbvmp0hxl, ,+s)*yr sof $9.0\,cents/kWh$, 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
