5. Dr. Denton Fender, a noted geologist, has discovered a site that she believes may hold a large deposit of natural gas. To test for the possible presence of natural gas, she proposes to drill a test hole, set off a small explosive charge, and use the resulting seismic pattern to indicate the likely presence or absence of natural gas. The process of testing a likely site has been divided into five tasks that are indicated in the following AON precedence network.

dSTART Dr. Fender has estimated the times and costs of each task assuming normal conditions, as well as the times and costs of each task assuming a crashed or reduced condition.

This information is indicated in the table that follows.

Normal Crash Task Duration Cost Duration Cost Slope START 0 - 0 - -

Task A 8 $100 6 $200 $50 Task 6 10 $ 70 5 $170 $20 TaskC 12 $260 8 $500 $60 Task D 4 $ 80 4 $ 80 -

Task E 5 $100 2 5 175 $25 END 0 - 0 - -

Under normal conditions, Dr. Fender estimates that the test procedure would take twenty-two days (the length of the critical path under normal conditions) and cost

$610 in diict costs.

a. Given the importance of new sources of natural gas, she wants to consider possible shorter scenarios; thus, she would like you to reduce the project one day at a