Please show all steps and fully explain. If excel spreadsheet is used show cell code. If done well I will give thumbs up!

Data on the critical path activities based on normal duration are shown below. Identify which activities must be reduced, by how much each is reduced, and the added cost above the normal time cost to reduce the project duration by 4 days from the Normal Time Duration. Your answer must show the new duration of activities you reduce and the total added cost of the reduction.

Activity Normal Time Days Shorter Duration Time Days Normal Distribution Cost Shorter Duration Cost $ 5100 5700 8100 8800 3100 5800 14200 121009 9100 E 7 5 11300