The XYZ Company desires to allocate its products (load) to their three projects from their three warehouses. The three warehouses, designated as X, Y, and Z have a capacity of 350, 450, and 200 respectively. The three projects, designated as P, Q, and R have a demand of 250, 450, and 300 respectively. 

The shipping costs per load to its destination are as follows: 

From X to its projects are 22, 18, and 26 respectively;

From Y to its projects are 12, 12, and 10 respectively; 

and From Z to its projects are 14, 20, and 10 respectively. 

1. Show the Network Presentation. 

2. Find the LP Model. 

3. Find the optimal solution using the NWC and stepping stone method.