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问下懂行的能人, 一斤面粉, 能蒸出几个一块钱一个的馒头, 我这早市上有卖5毛钱

问下懂行的能人,
一斤面粉,
能蒸出几个一块钱一个的馒头,
我这早市上有卖5毛钱一个的馒头,
都说对半挣,
是真的吗?