Finding Net Present Value

You can use MathML to find net present value by using the following sytax:
<Calculation>
  <expression className="PacificEdgeSoftware.Data.Calculations
     .Programmatic.NetPresentValueFixedRate30,SerenaSoftware.Data" />
  <RHSVariable name="cMonthly-Discount-Rate" identifier="rate" />
  <RHSVariable name="%RangeCalculation%NPV%Cost-Total%CURRENCY
     %CALENDAR_MONTH%StartMS%END%" identifier="costs" />
  <RHSVariable name="%RangeCalculation%NPV%Benefits%CURRENCY
     %CALENDAR_MONTH%StartMS%END%" identifier="benefits" />
</Calculation>