Source program contain 5 files:
  1. Eebas.gms  -> Base Case (Discount rate 5 %)
  2. Eed10.gms  -> Discount rate 10 % 
  3. Eed7-5.gms -> Discount rate 7.5 %
  4. Eet150.gms -> Domestic transportation cost of fossil fuel 150 %
                   compare with Base Case 
  5. Eet50.gms  -> Domestic transportation cost of fossil fuel 50 %
                   compare with Base Case 
