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Homework answers / question archive / University of MalayaCHEMICAL E kek Higher costs today can sometimes lead to higher savings in the future
University of MalayaCHEMICAL E kek
Higher costs today can sometimes lead to higher savings in the future. An LED bulb costs $30 and has a lifespan of 30,000 hours. In that time, it uses 300 kWh of electricity. A halögen bulb costs $5 and has a lifespan of 1,000 hours. In that time, it uses 60 kWh of electricity. Assuming that electricity costs 20 cents per kWh, how much will one save by using an LED bulb over its lifespan?
Answer:
Over a lifespan of 30,000, the total cost of using an LED bulb = purchase price + electricity cost = $30 + 300 * 0.20 = $30 + $60 = $90.
Over the same period, I would need 30,000/1,000 = 30 halogen bulbs.
The total cost of using halogen bulbs in the 30,000 hours periods = purchase price + electricity cost = 30*$5 + 30 * 60 * 0.20 = $150 + $360 = $510.
Note: Electricity usages over the lifespan of a halogen bulb (1,000 hours) is 60 KW halogen bulbs. So, for 30 bulbs it will be 30 * 60
So, total savings from using LED bulbs = $510 - $90 = $420.
