A given formwork system results in a productivity of 3 man-hours per 100 square feet of contact area. The productivity for placing the concrete in the wall is 2 man-hours per cubic yard of concrete placed. There are 2.5 cubic yards of concrete in 100 square feet of wall. The cost for a man-hour is $10. The cost of a cubic yard of concrete is $30. The formwork system is made up of panels each one foot in width by eight feet high. Each panel costs $40 and has an expected life of 30 re-uses. Calculate, in an orderly procedure, the unit cost of 1 square foot of finished wall.