The answer is not 0.001290 so don't answer with that please.

Light emitting diode (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incadescent light bulb costs $45 and lasts for 1,000 hours. A 7-watt LED, which provides the same light, costs $225 and lasts for 40,000 hours. A kilowatt-hour of electricity costs $.121, which is about the national average. A kilowatt-hour is 1000 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 cant tell which bulbs are older or newer) If you require a 10 percent return, at what cost per kilowatt-hour does it make sense to replace your incandescent bulbs today? (A negative enswer should be indicated bya minus sign. Do not round intermediate celculations and round your answer to 6 decimal places, e.g., 32.161616.) Break-even cost Light emitting diode (LED) light bulbs have become required in recent years, but do they make financial sense? Suppose a typical 60-watt incadescent light bulb costs $45 and lasts for 1,000 hours. A 7-watt LED, which provides the same light, costs $225 and lasts for 40,000 hours. A kilowatt-hour of electricity costs $.121, which is about the national average. A kilowatt-hour is 1000 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 cant tell which bulbs are older or newer) If you require a 10 percent return, at what cost per kilowatt-hour does it make sense to replace your incandescent bulbs today? (A negative enswer should be indicated bya minus sign. Do not round intermediate celculations and round your answer to 6 decimal places, e.g., 32.161616.) Break-even cost