3.4-13. The Metalco Company desires to blend a new alloy of 40 percent tin, 35 percent zinc, and 25 percent lead from several available alloys having the following properties: The objective is to determine the proportions of these alloys that should be blended to produce the new alloy at a minimum cost. A) Formulate a linear program model using compact form B) Convert the compact form LP to a LINGO model C) Solve the model and interpret the solution