Module 7: Assignments/Problem Set 7: 1) Complete the following

problems: a) 10.29 b) 12.1, 12.9, 12.17. c) 14.3, 14.4, 14.5

Problem 10.29 The Dubuque Cement Company packs 80-pound bags of

concrete mix. Time-study data for the filling activity are shown in

the following table. Because of the high physical demands of the

job, the companyÃƒÂ‚Ã‚Â’s policy is a 23% allowance for workers. a)

Compute the standard time for the bag-packing task. b) How many

observations are necessary for 99% confidence, within 5% accuracy?

Observations (seconds) Performance Element 1 2 3 4 5 Rating (%)

Grasp and place bag 8 9 8 11 7 110 Fill bag 36 41 39 35 112a 85

Seal bag 15 17 13 20 18 105 Place bag on conveyor 8 6 9 30b 35b 90

aBag breaks open; included as delay in the allowance factor.

bConveyor jams; included as delay in the allowance factor. The

letter a in this first sentence which states abag breaks the a is

above the word bag instead of below. The sentence that begins

bConveryor the b is above the word also at the beginning. Also, in

the chart above the numbers with a letter beside them is suppose to

have the letter above the number on the same side showing now my

computer wouldnÃƒÂ‚Ã‚Â’t do it, Thanks. Problem 12.1 L. Houts

Plastics is a large manufacturer of injection molded plastics in

North Carolina. An investigation of the companyÃƒÂ‚Ã‚Â’s

manufacturing facility in Charlotte yields the information

presented in the table below. How would the plant classify these

items according to an ABC classification system? PX L. Houts

Plastics Charlotte Inventory Levels Item Code # Average Inventory

(units) Value ($/unit) 1289 400 3.75 2347 300 4.00 2349 120 2.50

2363 75 1.50 2394 60 1.75 2395 30 2.00 6782 20 1.15 7844 12 2.05

8210 8 1.80 8310 7 2.00 9111 6 3.00 Problem 12.9 Southeastern Bell

stocks a certain switch connector at its central warehouse for

supplying field service offices. The yearly demand for these

connectors is 15,000 units. Southeastern estimates its annual

holding cost for this item to be $25 per unit. The cost to place

and process an order from the supplier is $75. The company operates

300 days per year, and the lead time to receive an order from the

supplier is 2 working days. a) Find the economic order quantity. b)

Find the annual holding costs. c) Find the annual ordering costs.

d) What is the reorder point? PX Problem 12.17 Radovilsky

Manufacturing Company, in Hayward, California, makes flashing

lights for toys. The company operates its production facility 300

days per year. It has orders for about 12,000 flashing lights per

year and has the capability of producing 100 per day. Setting up

the light production costs $50. The cost of each light is $1. The

holding cost is $0.10 per light per year. a) What is the optimal

size of the production run? b) What is the average holding cost per

year? c) What is the average setup cost per year? d) What is the

total cost per year, including the cost of the lights? Problem 14.3

The demand for subassembly S is 100 units in week 7. Each unit of S

requires 1 unit of T and 2 units of U. Each unit of T requires 1

unit of V, 2 units of W, and 1 unit of X. Finally, each unit of U

requires 2 units of Y and 3 units of Z. One firm manufactures all

items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to

make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, 2

weeks to make Y, and 1 week to make Z. a) Construct a product

structure. Identify all levels, parents, and components. b) Prepare

a time-phased product structure Problem 14.4 Using the information

in Problem 14.3, construct a gross material requirements plan. PX

Problem 14.5 Using the information in Problem 14.3, construct a net

material requirements plan using the following on-hand

inventory

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