ampl: reset; model GaseousChemicals.mod.txt; data GaseousChemicals.dat.txt; 
ampl: expand Total_Cost, Meet_Demand;
minimize Total_Cost:
	4*x['proc1'] + x['proc2'];

subject to Meet_Demand['A']:
	3*x['proc1'] + x['proc2'] >= 10;

subject to Meet_Demand['B']:
	x['proc1'] + x['proc2'] >= 5;

subject to Meet_Demand['C']:
	x['proc1'] >= 3;

ampl: solve; display x;
Gurobi 10.0.0: optimal solution; objective 14
1 simplex iterations
x [*] :=
proc1  3
proc2  2
;

# Interpretation: Gaseuos Chemicals should run process 1 for 3 hrs
# and Process 2 for 2 hours, for a minimum total cost of $14.