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The question contradicts itself. the bulb can not be both 400 watts and 14.5 kilowatts (14500 watts) at the same time.

Supposing it's a 400 watt bulb, in 24 hours it uses 0.4 times 24 units, in other words 9.6 units (1 unit is a kilowatt-hour).

Now suppose the cost is 14.5 p per kilowatt-hour or unit, the cost is 139.2 p or £1.39.

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