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【正文】 → G (78) C→ F→G (78) 123564A = 3 2 D = 4 5G = 2 0F = 2 8C = 3 0B = 2 1E = 2 6P1=0320320773278332103211 785878583232323230030058325832585830309 ABCDEFGABCDEFG800 20 40 60 6 (c) (d) { A , B , C , E , F } 32 30 77 78 58 10 8 1 2345 67A=3 C=1 P=0 B=5 D=4 E=3 F=3 H=4 G=2 0 0 3 3 3 3 8 8 3 7 4 8 8 8 8 8 8 8 12 12 8 9 11 12 12 12 15 15 12 13 16 17 15 15 17 17 ABPDFG 11 8 1243567B = 5C = 1P1=0E = 3D = 4F = 3H = 4G = 2303043878688128128 161712138383 1181291512151217171515A = 312 = Where is not needed for solution , but it is the slack time. 8 CFGHABDEA B C D E F H G 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 13 8 17 A B D F G 3 5 4 3 2 2 3 2 2 1 $ 50 125 125 120 100 Reduce A 3→2 costs $50 G 2→1 costs $100 Total $150 ? * * CP︰ ABDFG ABDH (a) 14 8 15 A B D F G H 2 5 4 3 1 4 2 3 2 2 1 2 － $125 125 120 － 150 * If we consider “ F” then we must consider “ H” along with “ F” . Reduce B by 2 D by 1 ? * (why ?) (why not 2 ?) (refer to Gantt Chart) (a) 15 8 (a) cost $125*2 (B) $125*1 (for D) Total︰ $375 CP︰ ABDFG ABDH ABEFG ABEH Time CP Activities Courent time Expedited time cost 12 A B D E F G H 2 3 3 3 3 1 4 2 3 2 2 2 1 2 － － $125 50 120 － 150 16 8 (a) One can consider DE for $175/wk or FH for $270/wk.
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