Question

5. A 60 W incandescent bulb costs $3.50 and has an average lifetime of 1,000 h. A 20 W compact fluorescent bulb, which gives the same amount of light, costs $26.99 and has an average lifetime of 10,000 h. How much money will you save over 10,000 hours if you choose the fluorescent bulb over the incandescent one? Assume that the average cost of electrical energy is 7 cents/kWh.

Answer 1

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