Hongxing building materials store sells a kind of building materials for a factory (consignment here means that the manufacturer provides the goods for free first, and then settles the account after t

Hongxing building materials store sells a kind of building materials for a factory (consignment here means that the manufacturer provides the goods for free first, and then settles the account after the goods are sold, not sold) Solution: (1) =60 (ton);

(2) ;

(3)

In order to obtain the maximum monthly profit, the material price should be set at 2 10 yuan per ton;

(4) I think Xiao Jing is wrong;

Reason: When the monthly profit is maximum, X is 2 10 yuan.

For monthly sales,

When x is 160 yuan, the monthly sales volume w is the largest.

When x is 2 10 yuan, the monthly sales volume w is not the largest.

Xiaojing is wrong.