The weekly output of a production process for Perk and Co. is shown below, together with data for labour and material inputs. Week Output 412 D 364 3 4 392 408 # Workers 6 55 6 Material (ft.) 2840 2550 2720 2790 The standard inventory value of the output is $155 per unit. Overhead is charged weekly at the rate of $1000 plus .5 times direct labour cost. Assume a 40-hour week and an hourly wage of $26. Material cost is $2.5 per running foot. Required: Compute the average multifactor productivity for this process.