Question: A stamping plant must be designed to supply an automotive engine plant with sheet metal stampings. The plant will operate one 8-hr shift for 250 day/yr and must produce 15,000.000 good quality stampings annually. Batch size - 104100 good stampings produced per batch. Scrap rate = 5%. On average, it takes 3 0 sec to produce each stamping when the presses are running. Before each batch, the press must be set up, and it takes 4 hr to accomplish each setup. Presses are 90% reliable during production and 100% reliable during setup. How many presses are needed?