How to get the cost after running solver function?

I have an assignment to submit which almost completed by me but there is last question I could not answer it. The question is saying that 

Let’s now create our last scenario, Scenario 16. Its parameters are identical to those in Scenario 15, except that there is a new consumer: Ferrisbourgh (FE) . Its demand is 120 units, and its distance to the DCs (in miles) is as follows: 70 to BO, 65 to NA, 85 to PR, 50 to SP and 70 to WO. Solve the problem optimally.  What is the optimal cost?