A laptop is operated for an average of three hours a day, and it remains off but connected to power the rest of the day. While it is working it demands 60W and when it is "off" it demands 3W. The cost of the electrical energy is $ 500 / kWh. How much does the energy I consume cost me per year the laptop? B) How much will I save if I disconnect it from the power when turn off ?.

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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A laptop is operated for an average of three hours a day, and
it remains off but connected to power the rest of the day. While it is
working it demands 60W and when it is "off" it demands 3W. The cost of the
electrical energy is $ 500 / kWh. How much does the energy I consume cost me per year
the laptop? B) How much will I save if I disconnect it from the power when
turn off ?.

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