Book Orders

using System;
using System.Globalization;
using System.Threading;

namespace BookOrders
{
    class BookOrders
    {
        static void Main()
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("en-GB");

            int orders = int.Parse(Console.ReadLine());
            int[] packets = new int[orders];
            int[] books = new int[orders];
            double[] prices = new double[orders];
            int[] discounts = new int[orders];
            double[] pricesNew = new double[orders];

            for (int i = 0; i < orders; i++)
            {
                packets[i] = int.Parse(Console.ReadLine());

                if (packets[i] < 10)
                {
                    discounts[i] = 0;
                }
                else if (packets[i] >= 110)
                {
                    discounts[i] = 15;
                }
                else
                {
                    int temp = 5;

                    for (int k = 10; k < 110; k+=10)
                    {

                        if (packets[i] >= k && packets[i] < k + 10)
                        {
                            discounts[i] = temp;
                            break;
                        }
                        else
                        {
                            temp++;
                        }
                    }
                }

                books[i] = int.Parse(Console.ReadLine());
                prices[i] = double.Parse(Console.ReadLine());
            }

            for (int m = 0; m < orders; m++)
            {
                pricesNew[m] = (packets[m] * books[m] * prices[m]) - ((packets[m] * books[m] * prices[m]) * discounts[m]/100);
            }

            double totalSum = 0;

            foreach (var item in pricesNew)
            {
                totalSum+= item;
            }

            int totalBooks = 0;

            for (int z = 0; z < orders; z++)
            {
                totalBooks += packets[z] * books[z];
            }

            Console.WriteLine(totalBooks);
            Console.WriteLine(totalSum.ToString("F"));
        }
    }
}