please do on excel i post it 2 times and i didnot get with calculation and on excel. thanks.

Q4. (05 points) The diagram below shows the activities on the nodes, and the table shows the normal time and crash time (in days) and cost for each activity. B Start D E Activity Normal Time Crash Time Cost per day to crash A 6 6 B 10 8 $100 c 5 4 $300 D 4 1 $700 E 9 7 $500 F 2 1 $650 a) Which activity should be crashed to reduce the project completion time by one day? b) Which activity should be crashed to reduce the project completion by 2 days