Chuck Sox makes wooden boxes in which to ship motorcycles. Chuck and his three employees invest a total of 40 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 320 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)