the blood bank wants to determine the least expensive way to transport available blood donations from Pittsburgh and Staunton to hospitals in Charleston, Roanoke, Richmond, Norfolk, and Suffolk. The supply and demand for donated blood is shown in Figure 5.36 along with the unit cost of shipping along each possible arc.

a. Create a spreadsheet model for this problem.

b. What is the optimal solution?

c. Suppose that no more than 1,000 units of blood can be transported over any one arc. What is the optimal solution to this revised problem?

Note:  The solution approach to this problem must use the matrix approach . The if-statement approach will not be accepted for grading. The modeling in this course are done using excel spreadsheets.