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1. How much money can NIU afford to spend now on an energy management system if the software will save the University $37,500 per year for the next 5 years? Use an interest rate of 8% per year. Draw the cash flow diagram. If the value of Bob's retirement portfolio increased from $250,000 to $1,274,000 over a 20 year period, with no additional deposits made over that period of time, what was his annual rate of return? 2