Operations management question

The table below provides productivity data for 3 employees. Use the data to answer the questions below. Please note that these are production workers. Their output can be stated either in units produced or if we multiply the units produced by the average sales value we can state their output in dollars. What is the Return on Investment (ROI) for each employee? Which Employee has the highest ROI? If we state output in units what is each employees hourly productivity? Which employee is most productive? If we state output in dollars what is each employees hourly productivity? Which employee is most productive