A mass-production plant has six machines and currently operates one 8-hour shift per day, 5 days per week and 50 weeks per year. The six machines produce the same part each at a rate of 12 parts per hour. (a) Determine the annual production capacity of this plant. (b) If the plant were to operate three 8-hour shifts per day, 7 days per week and 52 weeks per year, determine annual % increase in plant capacity?