proc optmodel; var XA1,XA2,XA3,XB1,XB2,XB3,XC1,XC2,XC3,XD1,XD2,XD3; max Z = 500XA1 + 650XA2 + 400XA3 + 750XB1 + 800XB2 + 700XB3 + 300XC1 + 400XC2 + 500XC3 + 450XD1 + 600XD2 + 550XD3; con XA1+XB1+XC1+XD1=12, XA2+XB2+XC2+XD2=17, XA3+XB3+XC3+XD3=11, XA1+XA2+XA3=10, XB1+XB2+XB3=10, XC1+XC2+XC3=10, XA1>=0,XA2>=0,XA3>=0,XB1>=0,XB2>=0,XB3>=0,XC1>=0,XC2>=0,XC3>=0,XD1>=0,XD2>=0,XD3>=0; solve; print XA1 XA2 XA3 XB1 XB2 XB3 XC1 XC2 XC3 XD1 XD2 XD3;run;
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