The details of weekly output and input for a fabrication process are as follows: output is 400 units, with a standard selling price of $100 per unit. For the week, total labor costs are: 10 workers at 40 hours for the week, paid $15 per hour. Total material costs for the 400 units are $5,000. Weekly overhead is charged at the rate of 1.5 times the labor costs. What is the multifactor productivity for the week?