13. Transportation Problem SnowDevil produces snowboards at its factories in Reno and Tahoe with weekly outputs of 30 and 20 units, respectively. This commodity is to be transported to three regional warehouse locations, Warehouses 1, 2, and 3, which have weekly requirements of 10, 15, and 25 units, respectively. Unit shipping costs are: From Reno to Warehouses 1, 2, and 3 respectively: 8, 7, and 6. From Tahoe to Warehouses 1, 2, and 3 respectively: 5, 9, and 4. Formulate this as a linear programming model to minimize shipping cost (Decision variables, Objective function and constraints). You don't need to solve it