Find the initial Basic Feasible Solution (IBFS) for the following Transportation Model using: North-West Corner method Least Cost Cell method - Vogel's Approximation method Problem 1: D1 D2 D3 D5 D4 15 Supply 35 S1 10 9 2 10 S2 5 2 40 4 15 S3 15 3 15 14 13 40 5 7 20 20 15 25 8 30 S4 Demand 20 20 10 35 Problem 2: D1 D3 D4 D2 30 30 Supply 7 19 70 10 S1 S2 S3 Demand 50 40 70 7 60 20 9 18 8 40 5 8 14