A house has an old gas furnace that is only 70% efficient . This means that only 70% of the heat produced by the gas goes into heating the house , while 30% of the least is lost . There is a constant charge per unit of gas , and the owner's gas bill is $1,200 per year . Instead of replacing the furnace , the owner keeps the old furnace but doubles the thicknessof insulation under the roof , thus cutting the heat loss by a factor of two . Assume that most of the heat supplied by the furnace goes into replacing the heat lost through the roof .If it costs $2,000 to install the insulation, how many years is the payback period , namely , after how many years would the cost of insulation equalthe savings on the gas bill ? Round your answer to the nearest tenth.

A house has an old gas furnace that is only 70% efficient . This means

1.	A house has an old gas furnace that is only 70% efficient . This means that only 70% of the heat produced by the gas goes into heating the house , while 30% of the least is lost . There is a constant charge per unit of gas , and the owner's gas bill is $1,200 per year . Instead of replacing the furnace , the owner keeps the old furnace but doubles the thicknessof insulation under the roof , thus cutting the heat loss by a factor of two . Assume that most of the heat supplied by the furnace goes into replacing the heat lost through the roof .If it costs $2,000 to install the insulation, how many years is the payback period , namely , after how many years would the cost of insulation equalthe savings on the gas bill ? Round your answer to the nearest tenth.
Answer» 2.7 3.6 3.3 4.3 Answer :C

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