A rectangular room is 42 ft by 28 ft. Resilient base is installed around the perimeter, except for two 3 ft door openings. Adding 5 percent waste, what linear footage should be carried?
Correct Answer
C) 140 lf
Room perimeter is 2 x (42 + 28) = 140 lf. Deduct two 3 ft doors: 140 - 6 = 134 lf. Add 5 percent waste: 134 x 1.05 = 140.7 lf, rounded to 141 lf. Because 141 lf is not listed, 140 lf is the closest listed value. Other choices deduct or add the openings incorrectly.
Why This Is the Correct Answer
Room perimeter is 2 x (42 + 28) = 140 lf. Deduct two 3 ft doors: 140 - 6 = 134 lf. Add 5 percent waste: 134 x 1.05 = 140.7 lf, rounded to 141 lf. Because 141 lf is not listed, 140 lf is the closest listed value. Other choices deduct or add the openings incorrectly.
Why the Other Options Are Wrong
Option A: 134 lf
resilient base, choice b: 134 lf is an intermediate from the steps (.
Option B: 147 lf
resilient base, choice c: 147 lf is wrong because 147 lf implies about 9.7% waste on the 134 lf net length; the accepted waste step is 5 percent in.
Option D: 151 lf
resilient base, choice d: 151 lf implies about 12.69% waste on the 134 lf net length; the accepted waste step is 5 percent in.
Memory Technique
Keep a rough-in sticker beside resilient base: if one number is skipped, the option drifts away from 140 lf.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Resilient base takeoff" to confirm that Room perimeter is 2 x (42 + 28) = 140 lf.
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