A quality-control review flags the following point: a crew of 3 workers spends 8 hours per day for 3 days on temporary protection. How many labor-hours are recorded?
Correct Answer
B) 72 labor-hours
The calculation gives 72 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 199.
Why This Is the Correct Answer
The calculation gives 72 labor-hours for the stated labor-hours.
Why the Other Options Are Wrong
Option A: 72 labor-hours (unadjusted)
labor-hours, choice a: 72 labor-hours (unadjusted) repeats the numeric result but changes the required label or rounding; 3 x 8 x 3 = 72. so the keyed form is 72 labor-hours.
Option C: 64
labor-hours, choice c: 64 backs into 8 when divided by 8; the accepted setup gives 9 on that same base.
Option D: 79
labor-hours, choice d: 79 backs into 9.88 when divided by 8; the accepted setup gives 9 on that same base.
Memory Technique
Keep a inspection mark beside labor-hours: if one number is skipped, the option drifts away from 72 labor-hours.
Reference Hint
Open Construction Jobsite Management, 5th Ed.; use the index entry or section for "labor-hours calculation" to confirm that The calculation gives 72 labor-hours for the stated labor-hours.
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