A roofer is working to cover a 2,500-square-foot roof. He must first install rafters,
then sheathing, then felt, and finally shingles. He assumes the previous tasks com-
pose 35%,20%,15%, and 30% of the total roofing activity, respectively. At a certain
point, the roofer gets the following information on the subtasks:
Subtask Unit1 Total Quantity Installed Quantity
Rafters EA 150 102
Sheathing SF 2,720 1,200
Felt SQ 27.2 10
Shingles SQ 27.2 5
1EA=each; SF=square feet. SQ (square), is 100 square feet; a unit
used mostly in roofing jobs.
Calculate the estimated percent complete for the roofing activity.
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