Problem 1. We are shipping boxes from central to local warehouses. Transportation costs per box are given on each arc. Note that Origin 2 cannot ship to Destination 2 (no arc connecting them). The route from Origin 1 to Destination 1 has a shipment limit: At most 20 boxes can be shipped via that route. We want to minimize the total cost. Formulate the LP problem below. What are your decision variables (x) ? State the units for each. write objective function and constraints.

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