Life can be about anything........
Answer:
You need to first use the Sum function to add up all the costs of September.
Then divide each September cost by the grand total that you got. After that format the last column to be percentages.
Look at the attached file for the formulas used.
1: Application
2: Presentation
3:Session
4: Transport
5:Network
6: Data link
7: Physical
Application is a Interface Layer and responsible Layer
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