An enterprise has three supply centers (A1, A2, A3) and four demand centers (DI, D2, D3, D4). The cost of carrying one unit of product between supply centers and demand is included in the table in the image. The table also includes the supply and demand (grain) of the centers.

1. When you create the initial solution according to the north-west method, what is the total transportation cost?

2. When you create the initial solution according to the lowest cost method, what is the total transportation cost?

3. What percentage does the cost vary?

D1 10 44 36 360 A2 A3 Miktar Talep Merkezleri D2 D3 83 53 66 77 53 69 240 500 D4 65 34 12 600 Miktar 700 500 500 1700 eri