Solution: Let's assume that there are X A-shapes and 50 X B-shapes. 80x+50 *(50-x)≤3490 40x+90 *(50-x)≤295080(50–y)+50y≤3490y≥ 1740(50–y)+90y≤2950y≤ 19， 17≤y≤ 19。 When y= 17 19, when y= 18, x=33, when y= 19, x=32, x=3 1, there are three kinds of gardening modeling collocation schemes. A33，b 17； A32，b 18； A3 1, B 19 A cost 800, B 960. The fewer A's, the better. Then the third one needs 3 1 A's and 19 B's, which is useful for you.