PLEASE HELP

In the project detailed in table below, activity labels indicate the major activities to be completed in a project. Normal Crash Duration Normal Duration Crash Immediate Cost ($) Cost (S) Predecessors Activity A (hours) 2 (hours) 2 10 0 None B 3 15 2 23 A 5 25 4 30 B D 3 20 1 24 E 6 30 4 45 F 1 5 1 0 G 7 35 6 50 F H 10 50 7 80 D,G 1- Construct the network for this project. 2- Identify the critical path and the normal completion time. 3- If we want to crash the duration of the project by four hours, specify which activities must be chosen to be crashed and what are the new duration and cost of the project