An 80 watt incandescent light bulb is operated for 15 hours, and a 15 watt fluorescent light bulb is operated for the same period of time. At 10 cents per kWh, what is the cost savings in using the fluorescent bulb?

Question

Mathematics

Martha Duarte

25 March, 10:10

An 80 watt incandescent light bulb is operated for 15 hours, and a 15 watt fluorescent light bulb is operated for the same period of time. At 10 cents per kWh, what is the cost savings in using the fluorescent bulb?

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Answers (1)

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June Dodson · Answer 1

Step-by-step explanation:

An 80 watt incandescent light bulb is operated for 15 hours. This means that the number of watt hour hours used is 80*15 = 1200 kilo watt hour.

A 15 watt fluorescent light bulb is operated for the same period of time. This means that the number of watt hour hours used is 15 * 15 = 225 kilo watt hour.

At 10 cents per kWh, the total cost of 1200 kilo watt hour would be 1200*10 = 12000 cents = $120

At 10 cents per kWh, the total cost of 225 kilo watt hour would be 225*10 = 2250 cents = $22.5

The cost savings in using the fluorescent bulb would be 120 - 22.5 = $ 97.5