The weekly output of a production procoss is shown below, together with data for labour and material inputs. The standard inventory value of the output Is $125 per unit. Overhead is charged weekly at the rate of $1,500 plus 0.5 times direct labour cost. Assume a 40-hour week and an hourly wage of $16. Material cost is $10 per running foot. What is the weekly average multi-factor productivity for this process? (Hint: use $ as a common unit for both numerator and denominator)

Week	Output	# Workers	Material (ft)
1	412	6	2840
2	364	5	2550
3	392	5	2720
4	408	6	2790