A company has two warehouses (W1 and W2] and three stores (S1, S2, and S3) located in different places. The shipment from warehouses to stores depends on the requests from stores. Assume S1 requires 8 items (of some product); S2 requires 5; S3 requires 2. At this time, W1 has 5 items and W2 has 10 items. We also know that shipping cost: from W1 to S1 is 1, W1 to S2 is 2, W1 to S3 is 4, W2 to SI is 3, W2 to S2 is 2, and W2 to S3 is 1. The manager wants to ship all required items to the stores while using the minimal ship cost. a. Please use Liner programming to model this problem (put it in the equation system). b. Use any tool (Excel, calculator, et al) to solve it and give the result