kwH?

[orangeman]

Let's say they charge $0.07 per kilowatt. (400 x 24) x 30 = 288000. Multiply that by 0.001 (converting to kilowatt) and you have 288. 288 x 0.07 is $20.16, which is the cost of running a 24-hour setup.
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So let me get this right...the 400 is the wattage of the light, the 24 is for how long I'm keeping the light on and the 30 is for the standard ammount of days in a month and the 288 is just the result of 0.001 and the 0.07 is the kwh cost.....if I'm right I only have one question.. whats the 0.001 for lol?