A hamburger factory produces 40,000 hamburgers each week. The equipment used costs $5,000 and will remain productive for 4 years. The labor cost per year is $9,500. a. What is the productivity measure of "units of output per dollar of input" averaged over the 3-year period? b. We have the option of $10,000 equipment, with an operating life of 5 years. It would reduce labor costs to $6,000 per year. Should we consider purchasing this equipment (using productivity arguments alone)?