A form work crew of 6 workers can complete 8 square-feet of concrete form work per labor hour when working at less than 8 feet above grade. At more than

8 feet above grade, productivity drops by 40%. Assuming a wage rate of $62 per hour (average rate per worker), determine the total labor cost to complete form work for a 40-foot by 90-foot rectangular-shaped building with14-foot tall walls. (hint: assume that form work is needed on both sides of the wall) O $2,015 O $12,090 O $56,420 O $72,540 $338,520 O $435,240