Chuck Sox makes wooden boxes in which to ship motorcycles. Chuck and his three employees invest a total of $20$ hours per day making the

$120$ boxes.

a$)$ Their productivity $=,$ boxes$/$hour $($round your response to two decimal places$).$

Chuck and his employees have discussed redesigning the process to improve efficiency. Suppose they can increase the rate to $125$ boxes

per day.

b$)$ Their new productivity $=,$ boxes$/$hour $($round your response to two decimal places$).$

c$)$ The unit increase in productivity is boxes$/$hour $($round your response to two decimal places$).$

d$)$ The percentage increase in productivity is $\%($enter your response as a percentage rounded to two decimal places$).$