Question

173.) An estimator determines that a crew of two carpenters and one laborer can complete erecting the formwork required for both sides of a 20' long x 8' high wall in two hours. The cost of a carpenter's workhour is $30 per hour. The cost of a laborer's workhour is $20 per hour. What is the estimated labor cost per square foot of contact area (sfca)? a. $.50/sfca b. $1.00/sfca c. $1.60/sfca d. $2.00/sfca

Answer 1

Contacted area = area of both sides of a 20' times 8' wall. = 2 times 20 times 8 square ft = 320 sq ft. Two carpenters and one labor complete the work in two hours. Now, two carpenters and one labor's per hour charge is $ (2 times 30 + 20) = $ 80. So, their two hours charge is $ (2 times 80) = $160. Thus, the estimated labor cost per area = $ 160/320 = $ 50/sfca. Hence obtain (a) is correct.