PresentValue.cs

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;

namespaceAlgorithms.Financial;

/// <summary>
/// PresentValue is the value of an expected income stream determined as of the date of valuation.
/// </summary>
publicstaticclassPresentValue
{
publicstaticdoubleCalculate(doublediscountRate,List<double>cashFlows)
{
if(discountRate<0)
{
thrownewArgumentException("Discount rate cannot be negative");
}

if(cashFlows.Count==0)
{
thrownewArgumentException("Cash flows list cannot be empty");
}

doublepresentValue=cashFlows.Select((t,i)=>t/Math.Pow(1+discountRate,i)).Sum();

returnMath.Round(presentValue,2);
}
}