Solutions_Problems_OM_11e_Stevenson
Chapter 02 - Competitiveness, Strategy, and Productivity
3.
(1) Week 1 2 3 4
(2) Output 30,000 33,600 32,200 35,400
(3) (4) (5) Worker Overhead Material Cost@ Cost @1.5 Cost@$6 $12x40 2,880 3,360 3,360 3,840
4,320 5,040 5,040 5,760
2,700 2,820 2,760 2,880
(6) (7)
Total MFP Cost (2) ? (6) 9,900 11,220 11,160 12,480
3.03 2.99 2.89 2.84
*refer to solved problem #2
Multifactor productivity dropped steadily from a high of 3.03 to about 2.84.
4. a. Before: 80 ? 5 = 16 carts per worker per hour.
After: 84 ? 4 = 21 carts per worker per hour.
b. Before: ($10 x 5 = $50) + $40 = $90; hence 80 ÷ $90 = .89 carts/$1.
After: ($10 x 4 = $40) + $50 = $90; hence 84 ÷ $90 = .93 carts/$1.
c. Labor productivity increased by 31.25% ((21-16)/16).
Multifactor productivity increased by 4.5% ((.93-.89)/.89).
*Machine Productivity
Before: 80 ÷ 40 = 2 carts/$1. After: 84 ÷ 50 = 1.68 carts/$1.
Productivity increased by -16% ((1.68-2)/2)
Chapter 03 - Product and Service Design
6.
Steps for Making Cash Withdrawal from an ATM 1. Insert Card: Magnetic Strip Should be Facing Down 2. Watch Screen for Instructions 3. Select Transaction Options:
1) Deposit 2) Withdrawal 3) Transfer 4) Other
4. Enter Information:
1) PIN Number
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8.
2) Select a Transaction and Account 3) Enter Amount of Transaction
5. Deposit/Withdrawal:
1) Deposit—place in an envelope (which you’ll find near or in the ATM) and
insert it into the deposit slot 2) Withdrawal—lift the ―Withdrawal Door,‖ being careful to remove all cash
6. Remove card and receipt (which serves as the transaction record)
Technical Requirements Ingredients Customer Requirements Taste Appearance Texture/consistency √ √ √ Handling √ Preparation √ √ √
Chapter 04 - Strategic Capacity Planning for Products and Services
2.
Efficiency?Actual output?80%
Effective capacityActual output = .8 (Effective capacity) Effective capacity = .5 (Design capacity) Actual output = (.5)(.8)(Effective capacity) Actual output = (.4)(Design capacity) Actual output = 8 jobs Utilization = .4
Utilization?Actual output
Design capacityActual output8??20 jobs
Effective capacity.4 10.
Design Capacity?a. Given: 10 hrs. or 600 min. of operating time per day.
250 days x 600 min. = 150,000 min. per year operating time.
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Total processing time by machine
Product
1 2 3 4
A 48,000 48,000 30,000 60,000 186,000
B 64,000 48,000 36,000 60,000 208,000
C 32,000 36,000 24,000 30,000 122,000
Total
NA?NB?NC?
186,000?1.24?2 machine150,000208,000?1.38?2 machine
150,000122,000?.81?1 machine150,000
You would have to buy two ―A‖ machines at a total cost of $80,000, or two ―B‖ machines at a total cost of $60,000, or one ―C‖ machine at $80,000.
3.
3 a b.
Total cost for each type of machine:
A (2): 186,000 min ? 60 = 3,100 hrs. x $10 = $31,000 + $80,000 = $111,000 B (2) : 208,000 ? 60 = 3,466.67 hrs. x $11 = $38,133 + $60,000 = $98,133 C(1): 122,000 ? 60 = 2,033.33 hrs. x $12 = $24,400 + $80,000 = $104,400
Buy 2 Bs—these have the lowest total cost.
Chapter 05 - Process Selection and Facility Layout
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Desired output = 4
Operating time = 56 minutes
CT?Operating time56 minutes per hour??14 minutes per unit
Desired output4 units per hourTask A B C D E F G H I
# of Following tasks
4 3 2 3 2 4 3 1 0
Positional Weight
23 20 18 25 18 29 24 14 5
a. First rule: most followers. Second rule: largest positional weight.
Assembly Line Balancing Table (CT = 14)
Task F A G Task Time 5 3 6 7 2 4 4 9 5 Time Remaining 9 6 – 7 5 1 10 1 9 Feasible tasks Remaining A,D,G B,G – B, E C – H – – Work Station I II D B C III E H IV
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b. First rule: Largest positional weight.
Assembly Line Balancing Table (CT = 14)
Work Station I Task F D Task Time 5 7 6 3 2 4 4 9 5 Time Remaining 9 2 8 5 3 10 6 5 – Feasible tasks Remaining A,D,G – A, E B,E – E – I II G A B III C E IV H I
c. Efficiency?
4.
a. l.
a e c Total time45??80.36%CTx no. of stations56
b f d g h
2. Minimum Ct = 1.3 minutes
Task a b c d e f g h
Following tasks
4 3 3 2 3 2 1 0
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