Instructions: use excel solver to resolve the following problems. You are to submit an excel spreadsheet with the solver models and solutions. Problem 1: Steelco manufactures three types of steel at different plants. The time required to manufacture I ton of steel (regardless of type) and the cost at each plant are shown in the table below Each week, 100 tons of each type of steel (1, 2 and 3) must be produced. Each plant is open 40 hours per week. Formulate a balanced transportation problem to minimize the cost of meeting Steelco's weekly requirements