Ch_7_7A_solution

Ch_7_7A_solution - 33.6 seconds per unit b 6 33 118 = = C T...

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============================ Ch. 7 =============================== 6.. a. FC = (P - VC) * Break-even (where FC = fixed cost, P = price, and VC = variable cost) $300,000 = ($23.00 - $8.00) * Break-even Break-even = 20,000 books b. Higher c. Lower 11. Issue Job Shop Flow Shop Number of Changeovers Many Few Labor content of product High Low Flexibility High Low 12. 60/.75 = 80 units/hour ============================ Ch. 7A =============================== 3. a. A B D C E F G 60 80 30 50 H 20 90 30 60
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b. C = production time per day/required output per day = (8 hour/day)(3600 seconds/hour)/240 units per day = 120 seconds per unit c. Work station Task Task time Idle time I A D 60 50 10 II B C 80 20 20 III E F 90 30 0 IV G H 30 60 30 d. Efficiency = C N T a = ) 120 ( 4 420 = .875 or 87.5% 9. a. C = production time per day/required output per day = (7 hour per day) (3600 seconds per hour)/750 units per day =
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Unformatted text preview: 33.6 seconds per unit b. 6 . 33 118 = = C T N i = 3.51 → 4 work stations c. A B D C E F G 20 7 20 H 15 10 16 8 22 d. Work station Task Task time Idle time I A B 20 7 6.6 II D F 22 10 1.6 III C 20 13.6 IV E G 15 16 2.6 V H 8 25.6 b. Efficiency = C N T a = ) 6 . 33 ( 5 118 = .702 or 70.2% c. Reduce cycle time to 32. New production level is (7 hours/day)(3600 seconds per hour)/32 seconds per unit) = 787.5 units per day. Therefore, they are 800 – 787.5 = 12.5 units short. Work (12.5 units )(32 seconds per unit) = 400 seconds or 6.67 minutes overtime. d. 1000 – 787.5 = 212.5 units short, work (212.5 units)(32 seconds per unit) = 6800 seconds or 113.3 minutes or 1.89 hours of overtime. May want to consider rebalancing the line....
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