Michelle Yeoh makes bagels with her team. Michelle and her employees invest a total of $12$ hours per day making $1131$ bagels.

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

Michelle and her employees have discussed redesigning the process to improve efficiency. Suppose they can increase the output to $1371$ bagels per day.

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

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