A clothing company is deciding what sort of production equipment to rent. Machine A costs $10,000 per month to rent and can produce a suit in 2 hours. Machine B costs $4,000 per month to rent and can produce a suit in 2.5 hours. The machines can work 10-hour days and each suit earns a $500 profit. Assuming every suit produced is sold, what is the minimum number of production days needed per month for Machine A to return as much profit as Machine B?
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正确答案: B