A company has introduced a process improvement that reduces processing time for each unit so that output is increased by 25% with less material but one additional worker required. Under the old process, five workers could produce 60 units per hour. Labor costs are $12 hour, and material input was $16/ unit. For the new process, material is now $10 /unit. Overhead is charged at 1.6 times direct labor cost. Finished units sell for $31 each. a) Compute single factor productivity of labor in the old system. (Compute it in four possible ways.) b) Compute all factor productivity for both old and new systems