Discussion
The economic thickness of insulation is the thickness at which
Answer: A
Correct answer: the sum of the insulation cost and the heat loss cost is least
The two costs pull opposite ways - more insulation costs more to install and saves more fuel - so their sum has a minimum, and that thickness is the economic one. Adding material beyond it still reduces the loss, just by less than it costs, since each further layer works against the resistance already in place.
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