Calculate Lead Time Williams Optical Inc. is considering a new lean product cell. The present manufacturing approach produces a product in four separate steps. The production batch sizes are 78 units. The process time for each step is as follows Process Step 1 9 minutes Process Step 2 8 minutes Process Step 3 S minutes Process Step 4 4 minutes The time required to move each batch between steps is 14 minutes. In addition, the time to move raw materials to Process Step 1 is also 14 minutes, and the time to move completed units from Process Step 4 to finished goods inventory is 14 minutes. The new lean layout willl allow the company to reduce the batch sizes from 78 units to S units. The time required to move each batch between steps and the inventory locations will be reduced to 2 minutes. The processing time in each step will stay the same Determine the value-added, non-value-added, and total lead times, and the value-added ratio under the present and proposed production approaches. If required, round percentages to one decimal place Present Approach Proposed Approach Value-added time Non-value-added time Total lead time Value-added ratio (as a percent) 26 min 26 min