A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?

11680 cents

Explanation:

The computer turned on 8 hours per day.

So, In 365 day the computer turn on 2920 hours (365*8 hours).

Power P = 400 W

the consumption of energy,

E = Pt

E = 400*2920

E = 1168 kWh

Now, electricity cost is 10 cents per kWh.

So, for 1168 kWh the electricity cost is 1168*10 = 11680 cents.

Hence, the electricity cost in 365 days is 11680 cents.

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