The details of weekly output and input for a fabrication process are as follows: output is 500 units, with a standard selling price of $110 per unit. For the week, total labor costs are: 10 workers at 40 hours for the week, paid $15 per hour. The material cost is $20 per unit and weekly overhead is charged at the rate of 1.5 times the labor costs. What is the multifactor productivity for the week?
Select one: SHOW WORK
a. 1.5
b. 2
c. 2.2
d. 1.8