The raw material for a product has a cost of 11.1 dollars per unit. The burden rate for the equipment that is doing all the machining operations on the part is 374 dollars per hour, the required time to finish the part is 9.22 minutes per part, while the setup time for the equipment is 2.31 hours. If this part is produced using lot sizes of 66 units, what percentage of the part cost is due to setup time? If the system must move to a 39 part lot size, how much must the setup time be reduced to keep the setup cost per part constant?