4. The Kalo Fertilizer Company makes a fer- tilizer using two chem- icals that provide nitro- gen, phosphate, and potassium. A pound of ingredient 1 con- tributes 10 ounces of nitrogen

and 6 ounces of phosphate, whereas a pound of ingredient 2 contributes 2 ounces of nitrogen, 6 ounces of phosphate, and 1 ounce of potassium. Ingredient 1 costs $3 per pound, and ingre- dient 2 costs $5 per pound. The company wants to know how many pounds of each chemical ingredient to put into a bag of fertil- izer to meet the mini- mum requirements of 20 ounces of nitrogen, 36 ounces of phos- phate, and 2 ounces of potassium while mini- mizing cost. a. b. Formulate a linear pro- gramming model for this problem. Solve this model by us- ing graphical analvele