A hamburger factory produces 60,000 hamburgers each week. The equipment used costs $10,000 and will remain productive for four years. The labor cost per year is $13,500.

What is the productivity measure of units of output per dollar of input averaged over the four-year period?

We have the option of $13,000 equipment, with an operating life of five years. It would reduce labor costs to $11,000 per year. Should we consider purchasing this equipment (using productivity arguments alone)?