Consider the following transportation problem: D1 D2 D3 D4 From Supply 7 16 5 9 S1 550 9 10 8 12 S2 380 6 14 7 15 S3 775 Demand 400 220 600 485 i. ii. Obtain the initial solution by least cost method. Write down the solution and the total initial cost. (2 marks) Obtain the optimal solution by MODI and stepping stone method. Write down the solution explicitly and the total minimum cost. (8 marks) Does it have alternative optimal solution? If yes, find out an alternative optimal solution. (4 marks)