Chapter7-Study-Problem-Solutions

Chapter7-Study-Problem-Solutions - P roduction and...

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Production  and  Operations  Analysis,  Fifth  Edition Solutions To Problems From Chapter 7 7.4 a) MPS for production of ICU2 computer : Week 6 7 8 9 10 11 Demand 220 165 180 120 75 300 Scheduled receipts 30 10 On-hand inventory 75 Net predicted demand 145 165 150 120 65 300 b) MRP calculations: motherboards Week 1 2 3 4 5 6 7 8 9 10 11 Gross reqts. 145 165 150 120 65 300 Net reqts. 145 165 150 120 65 300 Time phased net reqts. 145 165 150 120 65 300 Planned order release 145 165 150 120 65 300 c) MRP calculations: disk drives Week 1 2 3 4 5 6 7 8 9 10 11 Gross reqts. 290 330 300 240 130 600 Net reqts. 290 330 300 240 130 600 Time phased net reqts. 290 330 300 240 130 600 Planned order release 290 330 300 240 130 600 138
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Production  and  Operations  Analysis,  Fifth  Edition 7.10 K = $150, h = $.40 MRP calculations: valves Week 1 2 3 4 5 6 7 8 9 10 11 12 13 Gross reqts. 0 0 0 417 0 0 0 417 0 417 0 0 417 Scheduled rcpts 96 On-hand invent. 186 Net reqts. 231 0 0 0 321 0 417 0 0 417 T.P. Net reqts 231 0 0 0 321 0 417 0 0 417 λ = (231 + 321 + 417 + 417)/10 = 138.6 EOQ = 2 K λ h = (2)(150)(138.6) 0.4 = 322.4 ~ 322 POR 322 0 0 0 322 0 644 0 322 Ending invent. 91 91 91 91 92 92 319 319 224 139
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Solutions  for Chapter  7 7.11 a) K = $180, h = $.40 MRP calculations: motherboards Week 1 2 3 4 5 6 7 8 9 10 11 Gross requirement 145 165 150 120 65 300 Net requirements 145 165 150 120 65 300 Time phased net reqts. 145 165 150 120 65 300 λ = (145 + 165 + 150 + 120 + 65 + 300)/6 = 157.5 EOQ = (2)(180)(157.5) .40 = 377 Planned order release 377 0 377 0 0 377 Ending inventory 232 67 294 174 109 186 b) K = $25, h = $.01 MRP calculations: DRAM chips Week 1 2 3 4 5 6 7 8 Gross requirements 33,930 0 33,930 0 0 33,930 Net requirements 33,930 0 33,930 0 0 33,930 T.P. net reqts. 33,930 0 33,930 0 0 33,930 λ = (33930 + 33930 + 33930)/6 = 16965 EOQ = (2)(25)(16965) .01 = 9210 Planned order release 36,840 0 36,840 0 0 36,840 Ending inventory 2,910 2,910 5,820 5,820 5,820 8,730 c) K = $25, h = $.28 Week 1 2 3 4 5 6 7 8 Gross reqts. 1,131 0 1,131 0 0 1,131 Net reqts. 1,131 0 1,131 0 0 1,131 T.P. Net reqts. 1,131 0 1,131 0 0 1,131 λ = (1131 + 1131 + 1131)/6 = 565.5 EOQ = (2)(25)(565.5) .28 = 318 Planned order 140
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Chapter7-Study-Problem-Solutions - P roduction and...

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