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Outside it is 11∘C (52∘F), and inside your house you maintain 23∘C (73∘F). By how many...

Outside it is 11∘C (52∘F), and inside your house you maintain 23∘C (73∘F). By how many percent could you reduce your heating bill if you reduced the inside temperature by 4∘C to 19∘C (66∘F)? Consider only heat loss by conduction through the walls and roof, and assume that your bill is proportional to your energy consumption.

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Answer #1

we know, rate of flow of heat is proportional to diffrence in temperature of room and out side temperature.

so,

New Bill/Old Bill = (19 - 11)/(23 - 11)

= 0.667

= 66.7%

New Bill = 66.7% of old Bill

so, heating bill will be redued by = (100 - 66.7)

= 33.3% <<<<<<<<---------Answer

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