9. A fitter produces two types of fitting productsproduct A and product Busing a cutting machine (cutter) and a grinding machine (grinder). Product A requires 4 hours of the cutter and 8 hours of the grinder; product B requires 6 hours of the cutter and 4 hours of the grinder. The cutter has processing hours of at most 300 hours and at least 200 hours. The grinder has maximum processing time of 250 hours. The cost involved in the production of product A is 8 and of product B is 12. The fitter expects that the combined production for products A and B must total at least 50 units. The fitter wants to determine the number of units of product A (x1) and product B(x2) that will minimize the cost of manufacturing. a. Formulate a linear programming model for this problem. b. Transform this model into a standard form.

11. Solve the linear programming model formulation in Problem 9 for the fitter by using the computer. a. If the fitter can obtain additional hours either to cutter or grinder (but not both), which should he select? How much? Explain your answer.

b. Identify the sensitive ranges for the objective function coefficients and for the constraint quan-tity values. Then explain the sensitivity range for the demand for the products. c. What is the impact of optimal solution if the demand is reduced to 45?