please solve using excel. SHOW ALL EQUATIONS!!! And steps.

12. A project manager has compiled a list of major activities that will be required to install a computer information system in her firm. The list includes estimated completion times for activities and precedence relationships. page 777 Activity Immediate Predecessor Estimated Times (weeks) 2-4-6 6-8-10 7-9-12 2-3-5 F 3-4-8 5-7-9 G F B 2-2-3 OZ 3o.- W Imo> z 31-17 > MOT 2-3-6 3-4-5 4-5-8 5-8-12 1-1-1 6-7-11 8-9-13 End H,G,K, O a. Construct a network diagram. You can use either AOA or AON (see Example 5). b. If the project is finished within 26 weeks of its start, the project manager will receive a bonus of $1,000; and if the project is finished within 27 weeks of its start, the bonus will be $500. Find the probability of each bonus