Homework SourseProblem 1317 The Porsche Shop founded in 1985 by Dale Jensen
Problem 13-17
The Porsche Shop, founded in 1985 by Dale Jensen, specializes in the restoration of vintage Porsche automobiles. One of Jensen\'s regular customers asked him to prepare an estimate for the restoration of a 1964 model 356SC Porsche. To estimate the time and cost to perform such a restoration, Jensen broke the restoration process into four separate activities: disassembly and initial preparation work (A), body restoration (B), engine restoration (C), and final assembly (D). Once activity A has been completed, activities B and C can be performed independently of each other; however, activity D can be started only if both activities B and C have been completed. Based on his inspection of the car, Jensen believes that the following time estimates (in days) are applicable:
Jensen estimates that the parts needed to restore the body will cost $3000 and that the parts needed to restore the engine will cost $5000. His current labor costs are $400 a day.
| (a) | Choose the correct project network. |
Solution
(a) The correct answer is (i)
because in (ii) activity D can be started only if both activities B and C have been completed but it also start A. So, this is wrong
(iii) is also worng because activities B and C can be performed independently of each other
(iiv) both above conditions is hold.
(b) the expected project completion time is 22.5 days
(c) The best optimistic time is 2 days
Total cost $8800
Pessimistic time is 12 days
Total cost id $12800
| Activity | Optimistic | Most Probable | Pessimistic | Expected time |
| A | 3 | 4 | 8 | 4.5 |
| B | 5 | 8 | 11 | 8 |
| C | 2 | 4 | 6 | 4 |
| D | 4 | 5 | 12 | 6 |
