3. The manager of a crew that installs wood floors has tracked the crew's output over the past several weeks (see the table below). Each worker works 35 hours per week, and earns $23 per hour. The wholesale cost of lumber to the company is $7 per square foot, and the company charges its customers $12 per square foot of flooring installed Week Crew Size Lumber Used (sq.ft) Flooring Installed (sq ft) 1 4 480 440 2 2 250 232 a. Calculate labor productivity per worker hour for each week. b. Calculate lumber productivity per square foot for each we O C. Calculate sales revenue per dollar of input cost per week