The details of weekly output and input for a fabrication pro…

The details of weekly output and input for a fabrication process are as follows: output is 600 units, with a standard selling price of $50 per unit. For the week, total labor costs are: 8 workers at 40 hours for the week, are paid $20 per hour. Total material costs for the 400 units are $8,000. Weekly overhead is charged at the rate of 1.3 times the labor costs. What is the multifactor productivity for the week?