One batch of 25 units requires the following processing times per unit: move time for raw materials to cutting department, 6 minutes; cutting department, 4 minutes; move time to sewing department, 3 minutes; sewing department, 10 minutes; move time to packaging department, 2 minutes; and packaging department, 4 minutes. a. how much of the time spent to produce the units is value-added time? b. determine the total within-batch wait time. c. calculate the total lead time for the batch.