A production line operates 38 -hour shift(s) for 247 days per year and must annually produce 500,000 good quality parts of various designs in batch sizes of 5,000 parts to satisfy the plant's delivery schedule. Scrap rate is expected to be 4%. On average it takes 3.5 min. to produce each part when the automated production machines are running. Before each batch, the machine must be set up, and that takes 1.75 hours per setup. Availability of the machines is 99% during production and 98.5% during setup. How many automated production machines will be required to accomplish the specified production