Feedco produces two types of cattle feed, both consisting totally of wheat and alfalfa. Feed 1 must contain at least 80% wheat, and feed 2 must contain at least 60% alfalfa. Feed 1 sells fro $1.50lb, and feed 2 sells for $1.30lb. Feedco can purchase up to 1000 lb of wheat at $0.50 and up to 800 lb of alfalfa at $0.40/lb. Demand for each type of feed unlimited. a) Formulate a linear programming (LP) model to maximize Feedco's profit. Note: Clearly define your notation. b) Model the same problem in Excel and solve it using Excel Solver.