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Parents sometimes yell at their children for leaving the light on in their bedroom when they aren't in the room. If the child's room is lit with two 10 watt bulbs for one extra hour a day for everyday of the year (365), and the cost of energy is $0.068 per kilowatt*hour (kWh), how much money is wasted on lighting that isn't being used, to the nearest cent.

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Answer:

50 cent

Step-by-step explanation:

Given that :

Cost of energy = $0.068 per kilowatt-hour (kWh)

Number of bulbs = two 10 watt bulbs

Converting the power of the bulb to kilowatt :

2 * 10watt = 20 watt

1000 watt = 1 kilowatt

20 watt = x

1000x = 20

x = 20/1000

x = 0.02 kW

Cost of Energy consumed by bulb 1 hour for 365 days :

0.02kW * 1 * 365 * $0.068 = $0.4964

$0.4964 to cent

100 cent = $1

$0.4964 * 100 = 49.64 cent

49.64 = 50 (nearest cent)

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