A subcontract administrator catches this issue before award: a crew of 4 workers spends 7 hours per day for 3 days on temporary protection. How many labor-hours are recorded?
Correct Answer
B) 84 labor-hours
The calculation gives 84 labor-hours for the stated labor-hours. Other choices: the distractors come from omitting an adjustment, using the wrong rate, or applying a rounded shortcut for calculation item 155.
Why This Is the Correct Answer
The calculation gives 84 labor-hours for the stated labor-hours.
Why the Other Options Are Wrong
Option A: 84 labor-hours (unadjusted)
labor-hours, choice a: 84 labor-hours (unadjusted) repeats the numeric result but changes the required label or rounding; 4 x 7 x 3 = 84. so the keyed form is 84 labor-hours.
Option C: 75
labor-hours, choice c: 75 backs into 25 when divided by 3; the accepted setup gives 28 on that same base.
Option D: 92
labor-hours, choice d: 92 backs into 23 when divided by 4; the accepted setup gives 21 on that same base.
Memory Technique
Say the labor-hours rule aloud as a chain; the chain ends at 84 labor-hours, not an intermediate stop.
Reference Hint
Open Construction Jobsite Management, 5th Ed.; use the index entry or section for "labor-hours calculation" to confirm that The calculation gives 84 labor-hours for the stated labor-hours.
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