Rigid insulation boards cover 640 square feet at $2.35 per square foot. What material cost is estimated before waste?
Correct Answer
D) $1,504.
Cost equals area times unit price: 640 square feet times $2.35 per square foot equals $1,504.
Why This Is the Correct Answer
Cost equals area times unit price: 640 square feet times $2.35 per square foot equals $1,504.
Why the Other Options Are Wrong
Option A: $1,364 total.
$1,364 total. is below the supported result for insulation cost calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option B: $1,408 total.
$1,408 total. is below the supported result for insulation cost calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option C: $1,458 total.
$1,458 total. is below the supported result for insulation cost calculation; it likely omits allowance, conversion, coverage, or final round-up.
Memory Technique
Insulation Cost cart for Estimating Energy-Envelope: area first, times second, whole units last.
Reference Hint
Study anchor (closed-book): memorize Insulation cost calculation from California Energy Code, California Code of Regulations Title 24; CSLB. / Title 24 California Energy Code insulation quantity concepts; know the rule or calculation trigger without relying on exam-room lookup.
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