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9.3 A 60 W incandescent bulb costs $0.36 and lasts 1,000 hr; a 14 W CFL...

9.3 A 60 W incandescent bulb costs $0.36 and lasts 1,000 hr; a 14 W CFL bulb costs $4 and lasts 10,000 hr; and a 9.5 W LED bulb costs $13 and lasts for 25,000 hr. At $0.15/kWh, A. Find the cost of using incandescent bulbs for 25,000 hr. (Note: the cost includes the initial cost of the bulbs plus the energy used for 25,000 hr.) B. Find the cost of using CFLs for 25,000 hr. How much money is saved over incandescent bulbs? C. Find the cost of using LEDs for 25,000 hr. How much money is saved over incandescent bulbs?

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