using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

    public class Program

    {

        public static void Main()

        {

            List<Product> products = new List<Product>();

            products.Add(new Product { Name = "A", OriginalPrice = 68.97, MinPrice = 68.85, MaxPrice = 69.05, NewPrice = 0 });

            products.Add(new Product { Name = "B", OriginalPrice = 71.97, MinPrice = 71.92, MaxPrice = 71.98, NewPrice = 0 });

            products.Add(new Product { Name = "C", OriginalPrice = 69.97, MinPrice = 69.96, MaxPrice = 69.98, NewPrice = 0 });

            products.Add(new Product { Name = "D", OriginalPrice = 68.54, MinPrice = 68.54, MaxPrice = 68.54, NewPrice = 0 });

            products.Add(new Product { Name = "E", OriginalPrice = 68.90, MinPrice = 68.85, MaxPrice = 69.05, NewPrice = 0 });

            List<int> sequnce = new List<int>();

            sequnce.Add(3);

            sequnce.Add(5);

            sequnce.Add(9);

            foreach (var product in products)

            {

                bool isMinPriceExist = false;

                bool isMaxPriceExist = false;

                if (product.OriginalPrice >= product.MinPrice && product.OriginalPrice <= product.MaxPrice)

                {

                    double newMinPrice = product.OriginalPrice;

                    double newMaxPrice = product.OriginalPrice;

​

                    while (newMinPrice > product.MinPrice)

                    {

                        newMinPrice = System.Math.Round((newMinPrice - 0.01), 2);

                        int lastDigit = Program.LastNo(newMinPrice);

                        bool isLastDigitExist = sequnce.Contains(lastDigit);

                        if (isLastDigitExist == true)

                        {

                            isMinPriceExist = true;

                            break;

                        }

                    }

                    while (newMaxPrice < product.MaxPrice)

                    {

                        newMaxPrice = System.Math.Round((newMaxPrice + 0.01), 2);

                        int lastDigit = Program.LastNo(newMaxPrice);

                        bool isLastDigitExist = sequnce.Contains(lastDigit);

                        if (isLastDigitExist == true)

                        {

                            isMaxPriceExist = true;

                            break;

                        }

                    }

                    if (isMinPriceExist && isMaxPriceExist)

                    {

                        if ((product.OriginalPrice - newMinPrice) > (newMaxPrice - product.OriginalPrice))

                        {

                            product.NewPrice = newMaxPrice;

                        }

                        else

                        {

                            product.NewPrice = newMinPrice;

                        }

                    }

                    else if (!isMinPriceExist && isMaxPriceExist)

                    {

                        product.NewPrice = newMaxPrice;

                    }

                    else if (isMinPriceExist && !isMaxPriceExist)

                    {

                        product.NewPrice = newMinPrice;

                    }

                    else

                    {

                        product.NewPrice = product.OriginalPrice;

                    }

                }

                else

                {

                    product.NewPrice = product.OriginalPrice;

                }

                Console.WriteLine("New Price is:" + product.NewPrice);         

            }

        }

​

        public static int LastNo(double no)

        {

            no = no * 100;

            double lastNo = no % 10;

            return  Convert.ToInt32(lastNo);

        }

    }

    public class Product

    {

        public string Name;

        public double OriginalPrice;

        public double MinPrice;

        public double MaxPrice;

        public double NewPrice;

    }