Construct an Excel spreadsheet model with graphs to assist John with the following questions: If John expects his sales agents to use the phone for 50 hours per month, which plan should he select? Perform an analysis based on the idea that John believes his agents' average use will be 50 hours per month but knows that they will never use less than 40 hours or more than 60 hours per month. How does the decision change if the agents' usage habits change and they now use the phone on average 65 hours a month, but will never use more than 85 hours or less than 50 hours a month? Construct an Excel spreadsheet model with graphs to assist John with the following questions: If John expects his sales agents to use the phone for 50 hours per month, which plan should he select? Perform an analysis based on the idea that John believes his agents' average use will be 50 hours per month but knows that they will never use less than 40 hours or more than 60 hours per month. How does the decision change if the agents' usage habits change and they now use the phone on average 65 hours a month, but will never use more than 85 hours or less than 50 hours a month