The cost of lighting a 500-watt outdoor light for 8 hours is 30 cents.
1000 watts = 1 kilowatt
Therefore, 500 watt = 500/1000 = 0.5kw
Since electricity costs 7.5 cents per kilowatt-hour, then the cost for 8 hours will be:
= 0.5 × 8 × 7.5.
= 30cents
Therefore, the cost of lighting a 500-watt outdoor light for 8 hours is 30 cents.
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