#20 & 24

PROBLEMS Level A 19. Modify the original RedBrand problem so that all flows must be from plants to warehouses and from warehouses to customers. Disallow all other ares. How much does this restriction cost RedBrand, relative to the original optimal shipping cost? 20. In the original RedBrand problem, suppose the plants cannot ship to each other and the customers cannot ship to each other. Modify the model appropriately and reoptimize. How much does the total cost increme because of these disallowed routes? 21. In the original RedBrand problem, the costs for shipping from plants or warehouses to customer 2 were purposely made high so that it would be optimal to ship to customer 1 and then let customer I ship to customer 2. Use SolverTable appropriately to do the following. Decrease the unit shipping costs from plats and warehouses to customer 1, all by the same amount until it is no longer optimal for customer 1 to ship to 248 Chapter 5 Nerwork Models 2 appropria You can make up the required bounds. 24. Expand the RedBrand two-product spreadsheet model so that there are now three products competing for the arc capacity. You can make up the required input data. blom we assumed PROBLEMS Level A 19. Modify the original RedBrand problem so that all flows must be from plants to warehouses and from warehouses to customers. Disallow all other ares. How much does this restriction cost RedBrand, relative to the original optimal shipping cost? 20. In the original RedBrand problem, suppose the plants cannot ship to each other and the customers cannot ship to each other. Modify the model appropriately and reoptimize. How much does the total cost increme because of these disallowed routes? 21. In the original RedBrand problem, the costs for shipping from plants or warehouses to customer 2 were purposely made high so that it would be optimal to ship to customer 1 and then let customer I ship to customer 2. Use SolverTable appropriately to do the following. Decrease the unit shipping costs from plats and warehouses to customer 1, all by the same amount until it is no longer optimal for customer 1 to ship to 248 Chapter 5 Nerwork Models 2 appropria You can make up the required bounds. 24. Expand the RedBrand two-product spreadsheet model so that there are now three products competing for the arc capacity. You can make up the required input data. blom we assumed