The interest rate fields stores the estimated prime rate used that is used in the financial metric calculations.  It represents the time value of money in present value calculations.  For example, at a 4% interest rate, a payment of $100 due next year,  would be worth roughly $96 today. 

The default value is 4%.  We recommend using this value unless your client specifically requests that you use a different prime interest rate in their present value calculations. 

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