80X+30(30-X)≤ 1900
50X≤ 1000
X≤20
50X+60(30-X)≤ 1620
- 10X≤- 180
X≥ 18
It can be seen that there are three schemes: 18≤X≤20 and * * *.
Scheme 1: medium-sized corner 18 and small corner 12.
Scheme 2: medium-sized corner 19 and small corner 1 1.
Scheme 3: There are 20 middle-sized corners and 20 small corners 10.
(2) Scheme 1:18 * 860+12 * 570 = 22,320 yuan.
Scheme 2:19 * 860+1* 570 = 22610 yuan.
Option 3: 20 * 860+10 * 570 = 22,900 yuan.
It can be seen that the first scheme has the lowest cost, and the lowest cost is 22,320 yuan.