Chuck Sox makes wooden boxes in which to ship motorcycles. Chuck and his three employees invest a total of $30$ hours per day making the $200$ 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 $300$ boxes per day.

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

c$)$ The unit increase in productivity is $3\mathrm{.}33$ 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$).$