using System;

using System.Collections.Generic;

​

public class MonthlyContributions {

    public MonthlyContributions(double contri, int yrs, double avgGrwth) {

        this.Contribution = contri;

        this.Years = yrs;

        this.AverageGrowth = avgGrwth;

    }

    public double Contribution;

    public double AverageGrowth;

    public int Years;

}

​

public class Program

{

    public static void Main()

    {

        // Inputs

        double managementFee = 0.0079; // AMC is 1%, other ongoing cost fee for fund is 0.04%

        double contributionFee = 0.00;

        List<MonthlyContributions> contributions = new List<MonthlyContributions> {

            { new MonthlyContributions(825, 4, 0.06) },

            { new MonthlyContributions(1100, 10, 0.06) },

            { new MonthlyContributions(1375, 10, 0.06) },

            { new MonthlyContributions(1650, 5, 0.06) },

            { new MonthlyContributions(1925, 5, 0.01) },

            { new MonthlyContributions(2200, 5, 0.00) },

        };

​

        // Readonly

        double monthlyContribution = 0;

        double averageAnnualGrowth = 0.00;

        double yearsOfContribution = 0;

        double balance = 0;

        double totalContribs = 0;

        double totalFees = 0.0; 

        int totalYears = 0;

        foreach (var contriStage in contributions) {

            monthlyContribution = contriStage.Contribution;

            yearsOfContribution = contriStage.Years;

            averageAnnualGrowth = contriStage.AverageGrowth;

            for (int year = 0; year < yearsOfContribution; year++)

            {

                if (year < yearsOfContribution)

                    for (int month = 0; month < 12; month++)

                    {

                        totalContribs += monthlyContribution;

                        balance += monthlyContribution - (monthlyContribution * contributionFee);

                        totalFees += monthlyContribution * contributionFee;

​

                    }

​

                double annualGain = balance * averageAnnualGrowth;

                balance += annualGain;

                totalFees += balance * managementFee;

                balance -= balance * managementFee;

​

                Console.WriteLine($"year {totalYears + 1} balance: {Math.Round(balance, 2, MidpointRounding.AwayFromZero):N0}");

                totalYears++;

            }

        } 

        Console.WriteLine($"total contributions: {Math.Round(totalContribs, 2, MidpointRounding.AwayFromZero):N0}");

        Console.WriteLine($"total fees paid: {Math.Round(totalFees, 2, MidpointRounding.AwayFromZero):N0}");

        Console.ReadLine();

    }

}