Three suppliers A, B and C, each produce road grit which has to be delivered to council depots W, X, Y and Z. The stock held at each supplier and the demand from each depot is known. The cost, in pounds, of transporting one lorry load of grit from each supplier to each depot is also known. This information is given in the table.

 

Suppliers	Depot W	Depot X	Depot Y	Depot Z	Stock (Lorry Loads)
Supplier A	180	110	130	290	14
Supplier B	190	250	150	280	16
Supplier C	240	270	190	120	20
Demand (Lorry Loads)	11	15	14	10	50

1. From the Table write down the following; 
2. The number of lorry loads of grit that each supplier can supply 
3. The number of lorry loads of grit required at each depot
4. Which is the cheapest route to use? 
5. Which is the most expensive route to use? 
6. Use the VAT or VAM Method to supply out all the stocks 
7. Compute the total cost incurred 
8. Test out for degeneracy of solutions above