please solve the problem step by step

Consider the project network below. Suppose the duration of both activities A and D can be reduced to 1 day, at a cost of $15 per day of reduction. Also, activities E, G, and H can be reduced in duration by 1 day at a cost of $25 per day of reduction. What is the least-cost approach to crash the proj- ect 2 days? What is the shortest crashed" duration, the new critical path, and the cost of crashing? C1 12 A4 D5 G3 End Start B3 E4 H5 J1 F1 Activity Normal Crash A Time Time Time Slope $ A 4 1 3 $15 B 3 3 0 C 1 1 0 D 5 1 4 E 4 3 1 F 1 1 0 G 3 2 1 H 5 4 1 1 2 2 0 J 1 1 0 Least-Cost Crash Options $- $- $15 $25 $- $25 $25 $- $