John Lucy makes wooden boxes in which to ship motorcycles. John and his three employees invest a

Question:

John Lucy makes wooden boxes in which to ship motorcycles. John and his three employees invest a total of 40 hours per day making the 120 boxes.
(a) What is their productivity?
(b) John and his employees have discussed redesigning the process to improve efficiency. If they can increase the rate to 125 per day, what will be their new productivity?
(c) What will be their unit increase in productivity per hour?
(d) What will be their percentage change in productivity?