# Operations Management questions

Question 3. (9 points) COST-VOLUME-PROFIT MODEL

A manufacturing company produces two types of phones. Each phone sells for \$350 and costs \$150. The company incurs a fixed cost of \$20000 per day to lease their machines to manufacture the phones. Depending on the volume of production the company must also hire and schedule enough number of employees to carry out the production. The additional labor costs are \$1000, \$2200 and \$3500 per day, when the production volume is 0 to 100 units, 0 to 150 units, and 0 to 200 units per day, respectively. The company forecasts the daily expected demand for its phones to be 160 units.

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a) (3 points) Compute the break-even point for each range of production volume separately.

b) (4 points) Which production volume range is the best for the company? Explain clearly why.

c) (2 points) Suppose the company has a production capacity of 100 units per day. (Use this information independent of the production volumes mentioned above). What is the capacity cushion (in %) if the company produces only as much as the forecasted demand? What is the implied capacity utilization (i.e., the capacity utilization when the company chooses to produce only as much as the demand)?

Question 4. (16 points) OPTIMAL PRODUCT MIX

A brewery sells three types of beer: Ipa, Ale and Lager. Producing a gallon of Ipa brings a profit of \$40 and requires 3.5 lbs of hops, 5.5 lbs of barley and 2.5 lbs of yeast. Producing a gallon of Ale brings a profit of \$55 per gallon and requires 5 lbs of hops, 7 lbs of barley and 4 lbs of yeast. Producing a gallon of Lager brings a profit of \$45 per gallon and requires 3.5 lb of hops, 6 lbs of barley and 3 lbs of yeast. The brewery has 650 lbs of hops, 1000 lbs of barley and 500 lbs of yeast available in its inventory every week. You will formulate and solve a linear programming model to help the brewery determine the optimal mix of beer of each type (i.e., gallons of beer of each type to produce in order to maximize the total profit) in a week. Water is also used in producing all beer types, but water is plenty and available at no extra cost.

NOTE: SHOW ALL YOUR WORK.

a)(3 points) What are the decision variables? How many decision variables are there? Clearly explain the decision variables in English and provide the mathematical notation used in the algebraic formulation of the decision problem.

b)(2 points) What is the objective function? Clearly explain the objective function in English and provide the mathematical formulation.

c)(2 points) What are the constraints of the problem? Clearly explain each constraint in English and provide the mathematical formulation.

d)(1 points) Are there any sign or type restrictions in your formulation? Why or why not? Clearly explain the sign and type restrictions (if any).

e)Prepare a spreadsheet to determine the optimal production mix of using Excel Solver.

i.(2 points) Provide a screenshot of your spreadsheet model. The screenshot should show all the cells involved in formulating the optimization problem. NOTE: Do not copy and paste your spreadsheet to your answer report as an Excel object. Instead, capture a screenshot in Excel and paste this as an image.

ii.(2 points) Provide a screenshot of your spreadsheet with the formula view. You can switch from normal view to formula view in Excel by clicking the CTRL and ~ keys on your keyboard simultaneously.

iii.(2 points) Prepare the Solver model by logging all the information to the Solver Parameters window in Excel. Provide a screenshot of the Solver Parameters window.

iv.(2 points) Solve the optimization problem using Excel Solver. What is the optimal solution, i.e. the optimal values of the objective function and the decision variables?

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