In the United States, building insulation is specified by the R-value (thermal resistance in h·ft2·°F/Btu units). A home owner decides to save on the cost of heating the home by adding additional insulation in the attic. If the total R-value is increased from 15 to 25, the home owner can expect the heat loss through the ceiling to be reduced by
(a) 25%
(b) 40%
(c) 50%
(d) 60%
(e) 15%
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