KLASTORINE - Project Management ools &Trade; ort.pat-Adobe Acrobat Reader DC Fil
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KLASTORINE - Project Management ools &Trade; ort.pat-Adobe Acrobat Reader DC File Edit View Window Help 0 Home Tools Azadivar ch1D.pdf Sign In KI ASTORINF Pro... x 1. At periodic intervals, the Acme Bank has its lightin and ventilation system thor- oughly averhauled. Since this process causes some disruption in bank operations, the hank's managers want the overhaul to proceed in an orderly and effcient manner. To facilitate the project planning, the Acme managers bave broken the project into spe cific tasks. These tasks, along with their immediate predecessors and estimated dura- tion times for fast and slow warkers, respectively, are indicated in the following table. Fast Tinne Slow Time Task Predecessor Days (Days) 1.5 A. Check elecrical panels and circuits B. Repace B1 light burbs C. Clesn and service compressor in air conditioner D.Test and service heater E. Refll oil tanks E Clean and service electro-static filter G. Clean and service biower unit 0.5 C, D C, D For each task, Acme managers can hire one of two possible contractors to per- form the task. For each task, a less expensive contractor can be hired who charges S20 per day but works at the slow rate, or a more expensive contractor can be hired STUDY PROBLEMS 203 at S50 per day who works at the fast rate. Because tasks A and B both require the services of an electrical contractor, Acme managers have required that the same contractor perform both tasks A and B. Also, the cost of filling the oil tanks is not a function of the time required; the cost is strictly function of the number of gal- lons of oil needed (estimated curently at 15,000 gallons@ $1.7gallon). Acme Bank has hired you to manage this project; they have stated that they want the proj- ect completed at the lowest possible cost, but that the project must be completed within ninc days in order to minimizc disruption. Determine which contractors should be hired, what is the estimated total cost for the overhaul? When should each contractor begin work? 8:03 PM O Type here to search va 16-Nov-17Explanation / Answer
Fast Slow Final Cost Task Pre Fast Slow ES EF Cost ES EF Cost Start Finish Contractor Cost A NA 1.5 3 0 1.5 75 0 3 60 0 3 Slow 60 B NA 4 7 0 4 200 0 7 140 2 9 Slow 140 C A 2 4 1.5 3.5 100 3 7 80 3 5 fast 100 D A 3 5 1.5 4.5 150 3 8 100 3 6 fast 150 26250 E NA 0.5 5 0 0.5 26250 0 5 26250 4 9 NA 26250 F C,D 1 3 4.5 5.5 50 8 11 60 6 9 slow 60 G C,D 2 4 4.5 6.5 100 8 12 80 6 8 Fast 100 26925 Cost 240 26770 Total 9 Cost 26860
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