using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        const decimal hourlyRate = 2.50m;

        int[] hoursArray = {8, 24, 9, 7, 6, 12, 10, 11, 23, 1, 2, 9, 8, 8, 9, 7, 9, 15, 6, 1, 7, 6, 12, 10, 11, 23, 1, 2, 9, 8};

        Console.WriteLine("Hours {0,4} Parking Fee", "");

        decimal averageValue = 0m;

        foreach( int value in hoursArray)

        {

            decimal temp = hourlyRate * value;

            averageValue = (value > 8) ? averageValue += 20.00m : averageValue += temp;

            string parkingfee = (value > 8) ? String.Format("{0,-11}$20.00", value) : String.Format("{0,-9}  ${1}", value, temp);

            Console.WriteLine(parkingfee);

        }

        Console.WriteLine("Average parking fee: ${0}", averageValue/hoursArray.Length);

    }

}

​