please answer it with more details thanks so much ;)

Cost 1. The following table gives a list of activities durations and costs for a project Activity Depends on Normal Crashed Duration Cost Duration (days) (days) A 10 10 5 B A 20 35 10 A 25 60 15 D B,C 40 50 30 E A 20 5 5 F E 60 300 55 G F,D 10 50 7 20 50 85 55 20 330 110 i. ii. iii. iv. Draw an activity on arrow diagram for the project Calculate the normal cost and duration. Calculate the crashed cost and duration The start of the project is delayed by 25 days - what is the minimum amount that you can pay to complete the project by the completion date under the original schedule