A construction firm has been commissioned to renew a portion of the Alaska crude- oil pipeline that has fallen into a state of disrepair. The project activities with the estimated times and their relationships are shown below:

a. Prepare a project network. b. List the critical path activities and the expected project duration. c. Determine the scheduling times and total slack for all activities. d. In the contract, a bonus of $ 100,000 per day will be paid for each day the project is completed earlier than its expected duration. Evaluate the following alterna-tives to shorten the project duration and then make a recommendation:
1. Crash activity B by 4 days at a cost of $ 100,000.
2. Crash activity G by 1 day at a cost of $ 50,000.
3. Crash activity O by 2 days at a cost of $ 150,000.
4. Crash activity O by 2 days by drawing resources from activity N, thereby extending the time of N by 2 days.

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Immediate Predecessor Time, Days 10 28 Code Activity Assemble crew for job Build inventory with old line Measure and sketch old line Develop materials list Erect scaffolding Procure pipe Procure valves Deactivate old line Remove old line Prefabricate new line Place valves Place new pipe Weld pipe Connect valves Insulate Pressure test Remove scaffolding Clean up 30 45 B,D E,H E,G,H K,M K,M N,O PQ