The amount saved by using led bulb is 34,164 per year.
Given that,
Your utility company charges 13 cents per kilowatt-hour of electricity
We have to find,
The daily cost of keeping lit a 75 watt light bulb for 12 hours each day
And The amount save in a year if you replace the bulb with an led bulb that provides the same amount of light using only 15 watts of power.
According to the question,
Cost of electricity when the bulb use.
Cost of electricity per hour = (charge per kilowatt-hour).(daily cost )
= 13 × 75 = 9.75 per hour
Charge for 12 hours = (Cost of electricity per hour).(no. of hours)
= 9.75 × 12 = 117 per 12 hours
Cost of electricity per year for bulb = 117 × 365 = 42,705 per year
Cost of electricity when led bulb is use
Cost of electricity per hour = (charge per kilowatt-hour).(daily cost )
= 13 × 15 = 1.95 per hour
Charge for 12 hours = (Cost of electricity per hour).(no. of hours)
= 1.95 × 12 = 23.4 per 12 hours
Cost of electricity per year for led bulb = 23.4 × 365 = 8,541 per year
So, Total saved amount = Cost of electricity per year for bulb - Cost of electricity per year for led bulb
= 42,705 - 8,541 = 34,164 saved by using an led bulb.
Hence, The amount saved by using led bulb is 34,164 per year.
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