A manufacturing firm is able to produce 2,000 pairs of shoes per hour, at maximum efficiency. There are three eight- hour shifts each day. Production is actually 1,600 pairs of shoes per hour due to unavoidable operating interruptions. The plant is expected to run every day but was only able to operate for 27 days in September. What is the theoretical capacity for the month of September (30 days)? a) 1,440,000 shoes b) 1,488,000 shoes c) 1,036,800 shoes d) 1,296,000 shoes