May 16: ① Price: Currently, the manufacturer quotes the price of automobile grade 4mm at 131 yuan/heavy box, the price of 5- 10mm at 130 yuan/heavy box, the price of 12mm at 131 yuan/heavy box, the price of mirror grade at 141 yuan/heavy box, and the electronic grade at 149 yuan/heavy box. The ex-factory price of first-class products includes tax, and the transaction can be negotiated.② Production: There are 2 production lines with a daily melting capacity of 700/900 tons.