kWh Costs Question Hints

For the light bulb and microwave, remember that 1,000 W = 1 kW.
So 100 W = 0·1 kW and 800 W = 0·8 kW.

For the microwave, remember that 45 minutes is 3/4 of an hour.
So 45 minutes = 0·75 hours.

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