Bob makes wooden boxes in which to ship motorcycles. Chuck and his 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). Bob and his employees have discussed redesigning the process to improve efficiency. Suppose they can increase the rate to 220 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).