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1 kW = 1000 W

200 / 1000 = 0.2

So the 200 W bulb is also a 0.2 kW bulb.

0.2 x 30 = 6

So a 200 W bulb uses 6 kWh in 30 hours.

Now all you have to do is find the price of a kWh, and take that times 6.

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9y ago

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