using static System.Console;

using static System.Math;

​

public class Program {

    public static void Main() => WriteLine(CalculatesInterest(100M, 5, 0.01M));

    public static decimal CalculatesInterest(decimal valorInicial, int meses, decimal juros) => decimal.Round(valorInicial * (decimal)Pow(1.0 + (double)juros, meses), 2);

}