max 2250y 1 1+2250y 12+2250y 13+2250y 14+2250y 15+2250y 2 1+2250 y22+2250 y23+2250 y24+2250 y25+2250y 365448
standard time
Total purchase amount = processing amount
x 1 1+x 2 1+x 3 1+x 5 1+x 6 1-y 1 1-y 2 1-y 3 1-y 4 1-y 5 1-y 5 1 = 0
x 12+x22+x32+x42+x52+x 6 1-y 12-y22-y32-y42-y52-y62 = 0
x 13+x23+x33+x43+x53+x63-y 13-y23-y33-y43-y53-y63 = 0
x 14+x24+x34+x44+x54+x64-y 14-y24-y34-y44-y54-y64 = 0
x 15+x25+x35+x45+x55+x65-y 15-y25-y35-y45-y55-y65 = 0
impurity
0.088y 1 1+0.06 1y 12+0.020y 13+0.042y 14+0.50y 15-0.03y 1 1-0.03y 1.03y 12-0.03y 654380
0.088y 2 1+0.06 1 y22+0.020 y23+0.042 y24+0.50 y25-0.03y 2 1-0.03 y22-0.03 y23-0.03 y24-0.03 y25 & gt； 0
0.088y 3 1+0.06 1 y32+0.020y 33+0.042y 34+0.50y 35-0.03y 3 1-0.03y 32-0.03y 33-0.03y 34-0.03y 35 & gt； 0
0.088y 4 1+0.06 1 y42+0.020y 43+0.042y 44+0.50y 45-0.03y 4 1-0.03y 42-0.03y 43-0.03y 44-0.03y 45 & gt； 0
0.088y 5 1+0.06 1 y52+0.020y 53+0.042y 54+0.50y 55-0.03y 5 1-0.03y 52-0.03y 53-0.03y 54-0.03y 55 & gt； 0
0.088y 6 1+0.06 1y 62+0.020y 63+0.042y 64+0.50y 65-0.03y 6 1-0.03y 62-0.03y 63-0.03y 64-0.03y 65 & gt； 0
0.088y 1 1+0.06 1y 12+0.020y 13+0.042y 14+0.50y 15-0.06y 1 1-0.06y 1.06y 12-0.06y 64380
0.088y 2 1+0.06 1 y22+0.020 y23+0.042 y24+0.50 y25-0.06y 2 1-0.06 y22-0.06 y23-0.06 y24-0.06 y25 & lt； 0
0.088y 3 1+0.06 1 y32+0.020y 33+0.042y 34+0.50y 35-0.06y 3 1-0.06y 32-0.06y 33-0.06y 34-0.06y 35 & lt； 0
0.088y 4 1+0.06 1 y42+0.020y 43+0.042y 44+0.50y 45-0.06y 4 1-0.06y 42-0.06y 43-0.06y 44-0.06y 45 & lt； 0
0.088y 5 1+0.06 1y 52+0.020y 53+0.042y 54+0.50y 55-0.06y 5 1-0.06y 52-0.06y 53-0.06y 54-0.06y 55 & lt； 0
0.088y 6 1+0.06 1y 62+0.020y 63+0.042y 64+0.50y 65-0.06y 6 1-0.06y 62-0.06y 63-0.06y 64-0.06y 65 & lt； 0
Monthly output
y 1 1+y 12 & lt； 200
y 2 1+y22 & lt； 200
y 3 1+y32 & lt； 200
y 4 1+y42 & lt； 200
y 5 1+y52 & lt； 200
y 6 1+y62 & lt； 200
y 13+y 14+y 15 & lt； 250
y23+y24+y25 & lt； 250
y33+y34+y35 & lt； 250
y43+y44+y45 & lt； 250
y53+y54+y55 & lt； 250
y63+y64+y65 & lt； 250
stock
x 1 1-y 1 1 & lt； 500
x 1 1-y 1 1+x 2 1-y 2 1 & lt； 500
x 1 1-y 1 1+x 2 1-y 265438+x 3 1-y 3 1 & lt； 500
x 1 1-y 1 1+x 2 1+x 3 1-y 3 1+x 4 1-y 4 1 & lt； 500
x 1 1-y 1+x 2 1-y 2 1+x 3 1-y 3 1+x 4 1-y 4 1+x 5 1-y 5 1 & lt； 500
x 1 1-y 1+x 2 1-y 2 1+x 3 1+x 4 1-y 4 1+x 5 1-y 5 1+x 6 1+x 6 1 = 0
x 12-y 12 & lt； 500
x 12-y 12+x22-y22 & lt； 500
x 12-y 12+x22-y22+x32-y32 & lt； 500
x 12-y 12+x22-y22+x32-y32+x42-y42 & lt； 500
x 12-y 12+x22-y22+x32-y32+x42-y42+x52-y52 & lt； 500
x 12-y 12+x22-y22+x32-y32+x42-y42+x52-y52+x62-y62 = 0
x 13-y 13 & lt； 500
x 13-y 13+x23-y23 & lt； 500
x 13-y 13+x23-y23+x33-y33 & lt； 500
x 13-y 13+x23-y23+x33-y33+x43-y43 & lt； 500
x 13-y 13+x23-y23+x33-y33+x43-y43+x53-y53 & lt； 500
x 13-y 13+x23-y23+x33-y33+x43-y43+x53-y53+x63-y63 = 0
x 14-y 14 & lt； 500
x 14-y 14+x24-y24 & lt； 500
x 14-y 14+x24-y24+x34-y34 & lt； 500
x 14-y 14+x24-y24+x34-y34+x44-y44 & lt； 500
x 14-y 14+x24-y24+x34-y34+x44-y44+x54-y54 & lt； 500
x 14-y 14+x24-y24+x34-y34+x44-y44+x54-y54+x64-y64 = 0
x 15-y 15 & lt； 500
x 15-y 15+x25-y25 & lt； 500
x 15-y 15+x25-y25+x35-y35 & lt； 500
x 15-y 15+x25-y25+x35-y35+x45-y45 & lt； 500
x 15-y 15+x25-y25+x35-y35+x45-y45+x55-y55 & lt； 500
x 15-y 15+x25-y25+x35-y35+x45-y45+x55-y55+x65-y65 = 0
end
Remove the text and run it with lindo6. 1, and the result will come out.