Problem 2 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 compose 35%, 20%,

15%, and 30% of the total roofing activity. At a certain point, he gets the following information on the subtasks: Subtask Rafters Sheathing Unit EA SF SQ SQ Total Quantity 150 2,720 27.2 27.2 Installed Quantity 102 1,200 10 Felt Shingles * EA = 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. 5