Concept explainers
A public utility intends to buy a turbine as part of an expansion plan and must now decide on the number of spare parts to order. One part, no. X135, can be purchased for $ 100 each. Carrying and disposal costs are estimated to be 145 percent of the purchase price over the life of the turbine. A stockout would cost roughly $88,000 due to downtime, ordering, and "special purchase" factors. Historical records based on the performance of similar equipment operating under similar conditions suggest that demand for spare parts will tend to approxin1ate a Poisson distribution with a mean of 3.2 parts for the useful life of the turbine.
a. What is the optimal number of spares to order?
b. Carrying no spare parts would be the best strategy for what range of shortage cost?
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Chapter 12 Solutions
OPERATIONS MANAGEMENT LOOSELEAF W/ CONN
- Franklin Tooling, Inc., manufactures specialty tooling for firms in the paper-making industry. All of their products are engineer-to-order and so the company never knows exactly what components to purchase for a tool until a customer places an order. However, the company believes that weekly demand for a few components is fairly stable. Component 135.AG is one such item. The last 26 weeks of historical use of component 135.AG is recorded below. Week Demand Week Demand 1 2 3 4 5 6 7 8 9 10 11 12 13 137 136 143 136 141 128 149 136 134 142 125 134 118 14 15 16 17 18 19 20 21 22 23 24 25 26 131 132 124 121 127 118 120 115 106 120 113 121 119 Use OM Explorer’s Time Series Forecasting Solver to evaluate the following forecasting methods. Start error measurement in the fifth week, so all methods are evaluated over the same time interval. Use the default settings for initial forecasts.i. Naïve (1-Period Moving Average)ii. 3-Period Moving Averageiii. Exponential Smoothing,…arrow_forwardIf a bartender brought in his/her own bottle and is pouring and selling drinks from this bottle, there is a potential of which of these The portion sizes can vary Additional drinks for the bartender to sell Standard portion size larger than the actual Actual revenue less than the standardarrow_forward13.20. Southwood Furniture Company is a U.S.-based furniture manufacturer that offshored all of its actual manufacturing opera- tions to China about a decade ago. It set up a distribution center in Hong Kong from which the company ships its items to the United States on container ships. The company learned early on that it could not rely on local Chinese freight forwarders to arrange for sufficient containers for the company's shipments, so it contracted to purchase containers from a Taiwanese manufacturer and then sell them to shipping companies at the U.S. ports the containers are shipped to. Southwood needs 715 containers each year. It costs $1200 to hold a container at its distribution center, and it costs $6000 to receive an order for the containers. Determine the optimal order size, min- imum total annual inventory cost, number of annual orders, and time between orders.arrow_forward
- c) Even if there is substantial uncertainty in the parameters in the EOQ-model, it is still quite a useful model. Discuss why.arrow_forwardDefine the components of holding period return. Can any of these components be negative?arrow_forwardNext week, Super Discount Airlines has a flight from New York to Los Angeles that will be booked to capacity. The airline knows from past history that an average of 35 customers (with a standard deviation of 24) cancel their reservation or do not show for the flight. Revenue from a ticket on the flight is $134. If the flight is overbooked, the airline has a policy of getting the customer on the next available flight and giving the person a free round-trip ticket on a future flight. The cost of this free round-trip ticket averages $263. Super Discount considers the cost of flying the plane from New York to Los Angeles a sunk cost. By how many seats should Super Discount overbook the flight? (Use Excel's NORMSINV() function to find the correct critical value for the given a-level. Do not round intermediate calculations. Round your answer to the nearest whole number.) Overbooked by passengersarrow_forward
- Average demand (µ) 480 Demand Standard deviation (σdLT) 35 Service level 85% Service level alternate 89% 1. What is the required safety stock at a 85 percent service level? ______ units 2. What is the reorder point? ______ units 3.What is the required safety stock at a 89 percent service level? ______ units 4. What is the additional safety stock? ______ unitsarrow_forwardFisk Corporation is trying to improve its inventory control system and has installed an online system at its retail stores. Fisk anticipates sales of 58,800 units per year, an ordering cost of $4 per order, and carrying costs of $1.50 per unit. In the second year, Fisk Corporation finds that it can reduce ordering costs to $1 per order, but carrying costs will stay the same at $1.50 per unit. a-1. What is the economic ordering quantity for the second year? Economic ordering quantity (EOQ) a-2. How many orders will be placed during the second year? Number of orders a-3. What will the average inventory be for the second year? Average inventory Total costs units units a-4. What is the total cost of ordering and carrying inventory for second year? LAarrow_forward(a) Give examples of independent and related dependent demand (b) APL company assembles and sales an electronics device (ED) on a contract basis. End item ED has composed of 3 units of subassembly BG and 5 units of component DD. BG is assembled using 3 DDs and 4 FCs. There are orders of 500 and 875 units of the device (ED) at the beginning of week 6 and week 8. In assembling BG, an extra 20 percent scrap allowance must be added. DD can only be ordered in whole cases of 400 units per case. One case of DD is received in each of week 1 and week 2. Also, there are 200 units of BG and 425 units of DD now on hand. The lead time for the item BG, DD, and FC is 2 weeks and that is for the item ED is 1 week.i. Calculate the required number of DD and FC for producing 100 units of ED. There is no stock of any item. ii. Prepare a material requirements plan for the component DD.arrow_forward
- Next week, Super Discount Airlines has a flight from New York to Los Angeles that will be booked to capacity. The airline knows from history that an average of 25 customers (with a standard deviation of 15) cancel their reservation or do not show for the flight. Revenue from a ticket on the flight is $125. If the flight is overbooked, the airline has a policy of getting the customer on the next available flight and giving the person a free round-trip ticket on a future flight. The cost of this free round-trip ticket averages $250. Super Discount considers the cost of flying the plane from New York to Los Angeles a sunk cost. By how many seats should Super Discount overbook the flight? Note: Use Excel's NORM.S.INV() function to find the z value. Round z value to 2 decimal places. Round your answer to the nearest whole number.arrow_forwardAn organization has a goal to prevent the ordering of inventory quantities in excess of its needs. One individual in the organization wants to design a control that requires a review of all purchase requisitions by a supervisor in the user department prior to submitting them to the purchasing department. Another individual wants to institute a policy requiring agreement of the receiving report and packing slip before storage of new inventory receipts. Which of these controls is (are) relevant in achieving the stated goal? Explain your answer.arrow_forward1. Safety stock and service levels are positively correlated. True Falsearrow_forward
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