How to calculate bcr in excel

This assignment must be completed and submitted using a Microsoft Excel spreadsheet (.xls). Provide a source for each equation you use. Sources must be listed at the bottom of the spreadsheet. No title page or additional formatting is required.

Channels of Communication
It has been estimated that project managers spend up to 90% of their time communicating and your position at Roto Air is typical. Calculate the number of possible channels of communication if the project team were to grow to nine members, Important: show your work.
The total number of stakeholders, including the project team, is estimated at 75 people. Calculate how many more possible channels of communication the additional stakeholders beyond the team members represent. Important: show your work.
Benefit Cost Ratio (BCR)
Roto Air plans to spend $1,000,000 on this project, resulting in a total savings of $2,500,000 over the life of the project. Calculate the Benefit Cost Ratio. Important: show your work. Ignore any effects of the time value of money.
Roto Air also considered another project that would have partially satisfied their needs. It would have required a $750,000 investment and would result in a savings of $125,000 per year for 10 years. Calculate the Benefit Cost Ratio. Important: show your work. Ignore any effects of the time value of money.
Comparing only the BCRs, explain which project should Roto Air should have chosen. Ignore any effects of the time value of money.
Payback Period
Calculate the payback period for the $1,000,000 investment shown above. Important: show your work. Ignore any effects of the time value of money.
Calculate the payback period for the $750,000 investment shown above. Important: show your work. Ignore any effects of the time value of money.
Comparing only on the payback periods, explain which project should Roto Air have chosen. Ignore any effects of the time value of money.