Analysis: According to the meaning of the question, we can get the relationship between Y and X (total salary = worker A's salary+worker B's salary), and then we can get the minimum value of Y by using the nature of the function.

Solution: (1) y = 800 x+1200 (160-x) is simplified to y =-400 x+192000;

(2)∵ 160-x≥3x, x≤40, and because the function k < 0 in (1) increases with the decrease of x, when x=40, y is minimum =-400× 40 = 10.

Comments: This question uses the total wage = A worker's wage +B worker's wage, and the nature of linear function (when k < 0, y decreases with the increase of X).

The fastest answer, hope to adopt, thank you.