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1. |
A firm wants to install automatic machines to produce 250,000 castings per annum. The operation takes 1.5 minute of machine time and about 2% products are defective. Each machine is available for 2,000 hours of capacity per year. How many machines are required? |
A. | 6 |
B. | 5 |
C. | 4 |
D. | None of these |
Answer» D. None of these | |