Please help with D, E, and F. Thank you

Please help thank you

Office Automation, Inc., developed a proposal for introducing a new computerized office system that will standardize the electronic archiving of invoices for a particular company. Contained in the proposal is a list of activities that must be accomplished to complete the new office system project. Use the following relevant information about the activities: Immediate Time (weeks) Normal Crash Cost ($1000s) Normal Crash Activity Description Predecessor(s) A Plan needs 11 8 30 90 B Order equipment 8 6 120 150 Install equipment 10 7 100 160 D Set up training lab A 7 6 40 50 E D D 10 8 50 75 Conduct training course Test system F C, E 3 3 60 a. Which project network is correct? (i) (ii) B - C B Start A F Finish Start F Finish D E DHE b. Develop an activity schedule. If your answer is zero, enter "O". Latest Earliest Earliest Latest Earliest Start Critical Activity Start Finish Finish Slack Activity A o o 11 11 0 Yes B B 11 11 19 19 o Yes 19 19 29 29 o Yes D 11 12 18 19 1 No E 18 19 28 29 1 No F 29 29 32 32 o Yes c. What are the critical activities, and what is the expected project completion time? Critical Path: A-B-C-F Expected project completion time = 32 weeks. c. What are the critical activities, and what is the expected project completion time? Critical Path: A-B-C-F Expected project completion time = 32 weeks. d. Assume that the company wants to complete the project in six months or 26 weeks. What crashing decisions do you recommend to meet the desired completion time at the least possible cost? Work through the network and attempt to make the crashing decisions by inspection. Crash Activities Number of Weeks Cost ($1000s) A 3 60 B 2 30 1 20 D 1 10 E 1 0 120 e. Develop an activity schedule for the crashed project. If your answer is zero, enter "O". Earliest Latest Earliest Latest Critical Activity Start Start Finish Finish Slack Slack Activity A 0 o 8 8 o Yes B 8 9 x 14 15 X 1 X Yes 14 15 X 21 X 22 X 1 X Yes D 8 8 14 14 0 Yes E 14 14 22 X 22 X 0 Yes F 22 X 22 X 25 X 25 x 0 Yes f. What added project cost is required to meet the six-month completion time? Total added cost due to crashing $ 8,000 X