The Suregrip Tire Company carries a certain type of tire with the following characteristics:Average annual sales = 600 tiresOrdering cost = $40 per orderCarrying cost = 25 percent per yearItem cost = $50 per tireLead time = 4 daysStandard deviation of daily demand = 1 tirea. Calculate the EOQ.b. For a Q system of inventory control, calculate the safety stock required for service levels of 85, 90, 95, 97, and 99 percent. excelc. Construct a plot of total inventory investment versus service level.d. What service level would you establish on the basis of the graph in part c? Discuss.

The Suregrip Tire Company carries a certain type of tire with the following characteristics:Average annual sales = 600 tiresOrdering cost = $40 per orderCarrying cost = 25 percent per yearItem cost = $50 per tireLead time = 4 daysStandard deviation of daily demand = 1 tirea. Calculate the EOQ.b. For a Q system of inventory control, calculate the safety stock required for service levels of 85, 90, 95, 97, and 99 percent. excelc. Construct a plot of total inventory investment versus service level.d. What service level would you establish on the basis of the graph in part c? Discuss.

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Description: The Suregrip Tire Company carries a certain type of tire with the following characteristics:Average annual sales = 600 tiresOrdering cost = $40 per orderCarrying cost = 25 percent per yearItem cost = $50 per tireLead time = 4 daysStandard deviation o

Purchasing and Supply Chain Management

6th Edition

ISBN:9781285869681

Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson

Publisher:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson

Chapter16: Lean Supply Chain Management

Section: Chapter Questions

Problem 10DQ: The chapter presented various approaches for the control of inventory investment. Discuss three...

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The Suregrip Tire Company carries a certain type oftire with the following characteristics:Average annual sales = 600 tiresOrdering cost = $40 per orderCarrying cost = 25 percent per yearItem cost = $50 per tireLead time = 4 daysStandard deviation of daily demand = 1 tirea. Calculate the EOQ.b. For a Q system of inventory control, calculate the safety stock required for service levels of 85, 90, 95,97, and 99 percent.c. Construct a plot of total inventory investment versus service level.d. What service level would you establish on the basis of the graph in part c? Discuss.
A building materials stockist obtains its cement from a single supplier. Demandfor cement is reasonably constant throughout the year. Last year the company sold 2 000tonnes of cement. It estimates the costs of placing an order at around 25 MU each timean order is placed and charges inventory holding at 20% of purchase cost. The companypurchases cement at 60 MU per tonne.a) How much cement should the company order at a time?b) Instead of ordering EOQ, why not a order convenient 100 tonnes? Please mention formulas and do it in detail so I can understand.
An electronics retailer carries a particular cellular telephone with the following characteristics:Average monthly sales = 120 unitsOrdering cost = $25 per orderCarrying cost = 35 percent per yearItem cost = $300 per unitLead time = 4 daysStandard deviation of daily demand = .2 unitWorking days per year = 250a. Determine the EOQ.b. Calculate the reorder point for a 92 percent service level, assuming normally distributed demand.c. Design a Q system for this item.d. What happens to the reorder point when the lead time changes? What happens to the reorder point when the standard deviation of demand changes?
A pharmacist is trying to determine the inventory order and stock levels for a particular drug. The following information is available about the drug. Demand (D) 85 tablets/week Working weeks per year 52 weeks Unit holding cost per year (H) $6 Order cost (S) $44/order Standard deviation of weekly demand (sd) 15 tablets Lead time (L) 2 weeks Desired cycle service level 95% If the pharmacist uses the continuous review (Q) system to control the inventory of the drug, what would be the order quantity and reorder point? If the pharmacist uses the periodic review (P) system to control the inventory of the drug, what would be the review interval and target inventory level? (Hint: Use the EOQ model to derive the review interval P)
1. Sam's Cat Hotel operates 52 weeks per year, 5 days per week, and uses a continuous review inventory system. It purchases kitty litter for $10.50 per bag. The following information is available about these bags. Refer to the standard normal table for z-values. ≻Demand = 100 bags/week ≻Order cost = $58/order ≻Annual holding cost = 29 percent of cost ≻Desired cycle-service level=92 percent ≻Lead time = 1 week(s) (5 working days) ≻Standard deviation of weekly demand = 18 bags ≻Current on-hand inventory is 300 bags, with no open orders or backorders. a. What should R be? The reorder point is what? bags. (Enter your response rounded to the nearest whole number.)
David Alexander has compiled the following table of six itemsin inventory at Angelo Products, along with the unit cost andthe annual demand in units:IDENTIFICATION CODE UNIT COST ($) ANNUAL DEMAND(UNITS)XX1 5.84 1,200B66 5.40 1,1103CPO 1.12 89633CP 74.54 1,104R2D2 2.00 1,110RMS 2.08 961 Use ABC analysis to determine which item(s) should be care-fully controlled using a quantitative inventory technique and which item(s) should not be closely controlled.
A printing company anticipates using 40,000 reams of paper at a uniform rate over the next year. Each time they place an order for X units of reams of paper, it is charged a flat fee of $200. Carrying costs are $4 per unit per year. A. use the formula for Economic Order Quantity to find out how many reams of paper they should purchase in each order. B. how many orders should they place over the year?
Your firm uses a continuous review system and operates 52 weeks per year. One of the SKUs has the following characteristics.Demand 1D2 = 20,000 units/yearOrdering cost 1S2 = $40/orderHolding cost 1H2 = $2/unit/yearLead time 1L2 = 2 weeksCycle@service level = 95 percentDemand is normally distributed, with a standard deviation of weekly demand of 100 units.Current on-hand inventory is 1,040 units, with no scheduled receipts and no backorders.a. Calculate the item’s EOQ. What is the average time, in weeks, between orders?b. Find the safety stock and reorder point that provide a 95 percent cycle-service level.
Sam's Pet Hotel operates 52 weeks per year, 6 days per week, and uses a continuous review inventory system. It purchases kitty litter for $13.00 per bag. The following information is available about these bags: ≻Demand=75 bags/week ≻Order cost=$55.00/order ≻Annual holding cost=25 percent of cost ≻Desired cycle-service level=80 percent ≻Lead time=4 weeks (24 working days) ≻Standard deviation of weekly demand=15 bags ≻Current on-hand inventory is 320 bags, with no open orders or backorders. Part 2 a. Suppose that the weekly demand forecast of 75 bags is incorrect and actual demand averages only 50 bags per week. How much higher will total costs be, owing to the distorted EOQ caused by this forecast error? The costs will be $enter your response here higher owing to the error in EOQ. (Enter your response rounded to two decimal places.) a. What is the EOQ? What would the average time between orders (in weeks)? b. What should R be? c. An inventory withdraw…
Sam’s Cat Hotel operates 52 weeks per year, 7 days per week,and uses a continuous review inventory system. It purchaseskitty litter for $10.75 per bag. The following information isavailable about these bags.Demand = 95 bags>weekOrder cost = $58>orderAnnual holding cost = 25 percent of costDesired cycle@service level = 90 percentLead time = 4 weeks 128 working days2Standard deviation of weekly demand = 16 bagsCurrent on-hand inventory is 315 bags, with no open ordersor backorders.a. What is the EOQ? What would be the average time betweenorders (in weeks)?b. What should R be?c. An inventory withdrawal of 10 bags was just made. Is ittime to reorder?d. The store currently uses a lot size of 490 bags (i.e.,Q = 490). What is the annual holding cost of this policy?Annual ordering cost? Without calculating the EOQ, howcan you conclude from these two calculations that thecurrent lot size is too large?e. What would be the annual cost saved by shifting from the490-bag lot size to the EOQ?
Sam’s Cat Hotel operates 52 weeks per year, 7 days per week,and uses a continuous review inventory system. It purchaseskitty litter for $10.75 per bag. The following information isavailable about these bags.Demand = 95 bags>weekOrder cost = $58>orderAnnual holding cost = 25 percent of costDesired cycle@service level = 90 percentLead time = 4 weeks 128 working days2Standard deviation of weekly demand = 16 bagsCurrent on-hand inventory is 315 bags, with no open ordersor backorders. a. Suppose that the weekly demand forecast of 95 bags isincorrect and actual demand averages only 65 bags perweek. How much higher will total costs be, owing to thedistorted EOQ caused by this forecast error?b. Suppose that actual demand is 65 bags but that orderingcosts are cut to only $10 by using the Internet to automateorder placing. However, the buyer does not tell anyone,and the EOQ is not adjusted to reflect this reduction in S.How much higher will total costs be, compared to whatthey could be if…
It takes approximately 2 weeks (14 days) for an order ofsteel bolts to arrive once the order has been placed. The demandfor bolts is fa irly constant; on the average, the manager, MichelleWu, has observed that the hardware store sells 500 of these boltseach day. Because the demand is fairly constant, Michelle believesthat she can avoid stockouts completely if she orders the bolts atthe correct time. What is the reorder poin t?