3.4-12. The Metalco Company desires to blend a new alloy of C (b 40 percent tin, 35 percent zinc, and 25 percent lead from several available alloys having the following properties: 3.4- Alloy com sear 1 2 Property 3 4 5 ava Percentage of tin 60 25 45 for 20 50 Percentage of zinc Percentage of lead 10 15 45 50 Co 40 30 60 10 30 10 fro Cost ($/lb) 22 20 25 24 27 he un ho 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 programming model for this problem. c (b) Solve this model by the simplex method. C Daily