An appliance company has two warehouses and two retail outlets.  Warehouse A has 400 refrigerators, and warehouse B has 300 refrigerators.  Outlet I needs 200 refrigerators, and outlet II needs 300 refrigerators.  It costs $36 to ship a refrigerator from warehouse A to outlet I and $30 to ship a refrigerator from warehouse A to outlet II.  It costs $30 to ship a refrigerator from warehouse B to outlet I and $25 to ship a refrigerator from warehouse B to outlet II.  How should the company ship the refrigerators to minimize the cost? Solution first shift 200 refrigerators from warehouse A to outlet II. next shift 100 fefrigerators from warehouse A to outlet I and the remaining units from outlet II .