Question: The facility operates 10hrs/day. Considering personal fatigue and allowance, the facility effieciency is 80%. 900 non-deficitive parts per day need to be produced from a fabrication operation in the facility. This fabrication operation has scrap rate of 7%. This operation has time standrad for 12 minute per part. Each machine needs 10Min/day for warm-up, 20 min/day for machine adjustment, and 15 min/day for clean up. Calculate the number of machines required for this fabrication process.