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About the math of buying, huh?
Buyer b's is more suitable

Because A's purchasing method has no definite budget due to price changes, that is to say, the company has no definite budget for each purchase of 1000 kg, and the feed may not be worth buying, so it may be that the buyer is corrupt and the book is unknown.

B's purchase method is to go to 800 yuan only, that is, with a clear budget, the account is clear.