4. PERT NETWORK. All audits have a critical path, but auditors seldom recognize it as such without the aid of network analysis. In the auditing of liabilities, the following activities and estimated times have been identied: 0 1 Obtain schedule of liabilities 2 1 2 Mail conrmations 12 2 6 Process conrmations 39 6 7 Investigate debit balances 5 1 3 Vouch selected liabilities 64 3 4 Test accruals and amortization 4 1 4 Test pension plan 4 4 5 Reconcile interest expense to debt 8 5 7 Verify debt restriction compliance 5 7 8 Review subsequent payments 10 REQUIRED: a. The PERT Network, identifying the critical path and including slack times. 5. New York Building Corporation uses the critical path method to monitor construction jobs. The company is currently 2 weeks behind schedule on Job #181, which is subject to a P10,500 per week completion penalty. Path AB-C-F-GHI has a normal completion time of 20 weeks, and critical path AD-EF-G-HI has a normal completion time of 22 weeks. The following activities can be crashed. Activities Cost to Crash 1 Week Cost to Crash 2 Weeks BC P 8,000 P15,000 DE 10,000 19,600 EF 8,800 19,500 REQUIRED: a. New York Building desires to reduce the normal completion time Job #181 and, at the same time, report the highest possible income for the year. New York Building should crash a. Activity BC 1 week and activity EF 1 week c. Activity EF 2 weeks b. Activity DE 1 week and activity BC 1 week d. Activity DE 1 week and activity EF 1 week b. Compute for the cost to crash of the activities. 3. PERT NETWORK. A company is faced with the following PERT network situation (time in days): 3-45 REQUIRED: a. Calculate t'3 (expected time) for each activity. For each activity, the estimates are to, tm, tp, in that order. b. Calculate the total time for each path and identify the critical path. 1. Dayagsky Construction Firm, Inc. will soon begin to work on a building for US tea that was initially started by another rm that has gone out of business. The construction firm's schedule of activities and related expected completion time for US tea project are presented in the following time table: Activity Code Activity Description Estimated Time {in weeks! Obtain on-site work permits Repair damages done by vandals Inspect construction materials left on site Order and receive construction materials Apply for waiver to add new materials Obtain waiver to add new materials Perform electric work Complete interior partitions ||I mmmdmomw mmUOOWW> I LQWNNHWN REQUIRED: a. Prepare the PERT Network for the US Tea project b. What is the critical path and its expected time in weeks? c. What is the shortest path and its slack time in weeks? 2. A company is faced with the following PERT network situation for a certain project (time in days): '1, Start 5-8-11 5*816 8-10-12 __________+ .____-> p 2'! W 942-15 REQUIRED a. Determine the expected time (te) for each activity. b. Identify the critical path(s) c. What is the shortest time to complete the entire project