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Mathematics synchronization of the second day of junior high school, volume 2, answers
If x pieces of product A are produced, 50-x pieces of product B are produced. According to the meaning of the question

1.2x+ 1(50-x)≤60

0.8x+ 1.4(50-x)≤43

To solve this set of inequalities, you must

45≤x≤50

Then x can be 45, 46, 47, 48, 49, 50. Therefore, there are six distribution schemes.

Then, let the total cost be y yuan.

y=30x+40(50-x)

That is, y=- 10x+2000.

Because k =- 10 < 0, y decreases with the increase of x.

Therefore, when x=50, the value of y is the largest.

A: Within the permitted range, 50 pieces of product A should be produced to achieve the lowest total cost.