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Problem 1 0 - 3 0 Break - Even Replacement [ LO 2 ] Light emitting diode ( LED ) light bulbs have become required

Problem 10-30 Break-Even Replacement [LO2]
Light emitting diode (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent light bulb costs $.52 and lasts for 1,000 hours. A 15-watt LED, which provides the same light, costs $3.75 and lasts for 12,000 hours. A kilowatt-hour is 1,000 watts for 1 hour. Suppose you have a residence with a lot of incandescent bulbs that are used on average 500 hours a year. The average bulb will be about halfway through its life, so it will have 500 hours remaining (and you can't tell which bulbs are older or newer). If you require a return of 11 percent, at what cost per kilowatt-hour does it make sense to replace your incandescent bulbs today? ( A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answer to 6 decimal places, e.g.,32.161616.)
\table[[Break-even cost,$,0.006469]]
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