Sams Limited supplies Stones from 3 farms A, B and C. It has to supply to 3 sites 1 ,2 and 3. The costs of supplying from each farm to each site are given in the table below. To From Site 1 Site 2 Site 3 Supply Farm A 2 3 9 100 Farm B 5 6 4 100 Farm C 4 1 2 100 Demand 180 60 60 300 a. Using the north west corner rule find the initial feasible solution. (5 marks) b. Test the solution for optimality using either stepping stone method or MODI (10 Marks) c. Develop an improved solution to the transportation