DECISION VARIABLES C-30 = X1 Chemical compound C-92 = X2 Chemical compound D-21 = X3 Chemical compound E-11 = X4 Chemical compound OBJECTIVE FUNCTION Where z can be = 50 or 25 Min (z) = 0.12x1 + 0.09 x2 + 0.11x3 + 0.04x4 CONSTRAINTS X4 15% X1 + x2 >45% X2 + x3 45% X2 + x3