$(1)$ Solve the supply chain optimization problem with initial settings of parameters for brewing, packaging, and demand. Describe the solution by providing the total cost $($minimum cost$)$ and quantities of beer being shipped between each pair of locations.

$(2)$ Due to low demand for its products, the brewing company is thinking about closing any brewing location that is operating at minimum capacity. Reviewing the solution to the optimization problem, which brewery would you close $($if any$)?$

$(3)$ Due to low demand, the company may also want to close one of its packaging facilities. Which packaging facility would you close $($if any$)?$

$(4)$ Try multiplying demand by $2,3,4,$ or higher multiples. You can do this by modifying one line of the Python program. You can see the initial setting: demand$\_$multiplier $=1$