ABC Company manufactures snowblowers in factories located in Toronto and Detroit. These are shipped to regional distribution centers in Chicago and Buffalo, where they are delivered to the supply houses in New York, Philadelphia, and St. Louis. The figure below illustrates the basic network representation of this situation. The shipping costs vary, as shown in the following table. Forecasted demands for New York City, Philadelphia, and St. Louis are also seen in this table, as are the available supplies of snowblowers at the two factories. Notice that snowblowers may not be shipped directly from Toronto or Detroit to any of the final destinations. This is why Chicago and Buffalo are listed not only as destinations but also as sources. (a) Help the company find the minimum transportation costs associated with shipping sufficient snowblowers to meet the demands at the three destinations while not exceeding the supply of each factory. (b) A few years later, the company can ship its products from Toronto to New York City directly, and the transportation cost between the two cities is $8 per unit. Now what is the best transportation plan for the company? (c) Compare the two solutions from (a) and (b), are they the same? If NOT, which plan is better