IDetail ran a booming IBC business during the winter semester. They would detail automobiles while customers waited. With their initial way of cleaning vehicles--sequentially, like an assembly line--they were able to detail 5 vehicles per hour utilizing 7 workers. After some thought and experimentation, they changed the layout by placing multiple vehicles in adjacent stalls and working on them somewhat simultaneously. After these changes they were able to service 7 vehicles per hour with 9 workers. Required:
a. Prior to making the changes described above, what was the single-factor productivity for iDetail, in terms of workers? (Display your answer to two decimal places.)
b. After making the changes described above, what was the single-factor productivity for iDetail, in terms of workers? (Display your answer to two decimal places.)
c. After making the changes described above, by how much did the single-factor productivity improve for iDetail? (Write your answer as a percentage and display your answer to two decimal places.)