Question

QUESTION 9 Consider the following project; for which activities is it possible that the slack can be greater than zero? Activity Immediate Predecessors B, E a. Only activities B or E could have slack, but they could not both have slack. Ob. Only activities B or C could have slack, but they could not both have slack. Oc. It is possible for any or all activities in this project to have slack. Od. It is possible for either all three of activities C,D and E to have slack, OR for activity B to have slack. 0 e. Only activities A or F could have slack, but they could not both have slack. QUESTION 10 Consider the following project. Assume indirect costs to be $10,000 per week, and that there are no penalty costs for late completion. Total "normal" direct costs, to complete the project in "normal" time, are $200,000; they would like to "crash" the project as long as it saves money (.e. find the MINIMUM COST SCHEDULE). What would be the total REDUCTION in project duration and the REDUCTION intotal proiectcosts if the project is crashed to achieve the minimum cost schedule? (Note that the table provides normal time, maximum amount that normal time can be reduced by, and cost per week to reduce normal time) Immediate Normal Time Max possible time Cost of Crashing (weeks) Reduction (weeks)per Week (S) ActivityPredeces 12,000 None 3,000 None 9.000 Click Save and Submit to save and submit. Click Save All Answers to save all answers Save All Answers

Answer 1

9

It is possible for all three activities C, D, and E to have slack or for activity B to have slack

There are two routes in this network. A-B-F and A-C-D-E-F. This means A and F are common and will be on the critical path. Thus the only option is either C,D, and E or B.

10

The minimum cost schedule reduces the project duration by 3 weeks and saves 1100 dollars from the original normal cost of the project

The result is shown below using excel solver.

+ ngData Analysis ゴるSoler From Access Connections 쉬 From Welb From Other Eisting Refresh From Text Sources Connections All-Edit Links Text to Flash Remove Data Consolidate What-lf Relationships Group Ungroup Subtotal Columns Fill Duplicates Validation Analysis Get External Data Connections Sort & Filter Data Tools Outline Activity 0 Final 1Activity Normal Max crash Crash slope To crash Start Finish 0 12000 Solver Results 0 Solver has converged to the current solution. All Constraints are satisfied. 10 A,B 12 O Keep Solver Soluton 0 10 17 O Bestore Original Values 17 F,G 20 17 Return to Solver Parameters Dialog outline Reports 10 17 19 Save Scenario. 13 Total time20 Solver has converged to the current solution. All Constraints are satisfied 14 Direct cost 200000 15 Indirect cost 200000 Solver has performed 5 iterations for which the objective did not move significantly. Try a smaller convergence setting, or a different starting point 16 Crash cost19000 17 Totl cs419000 18 20 Sheet167 Sheet1168 Sheet1169 Sheet170 Sheet1171 Sheet1172Sheet117 回凹 + 115%