salesF2Round

using System;

public class ComputerSales
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Enter the number of computer models: ");
        int numModels = int.Parse(Console.ReadLine());

        int totalSales = 0;
        int totalRatings = 0;

        for (int i = 0; i < numModels; i++)
        {
            Console.WriteLine("Enter sales and rating for model {0}: ", i + 1);
            int salesAndRating = int.Parse(Console.ReadLine());

            int sales = salesAndRating / 100; // possible sales
            int rating = salesAndRating % 10; // rating

            totalSales += CalculateSales(sales, rating);
            totalRatings += rating;
        }

        double averageRating = (double)totalRatings / numModels;
        double averageSales = (double)totalSales / numModels;

        Console.WriteLine("Average rating: {0:F2}", averageRating);
        Console.WriteLine("Average sales: {0:F2}", averageSales);
    }

    public static int CalculateSales(int sales, int rating)
    {
        double calculatedSales;
        switch (rating)
        {
            case 2:
                calculatedSales = 0;
                break;
            case 3:
                calculatedSales = sales * 0.5;
                break;
            case 4:
                calculatedSales = sales * 0.7;
                break;
            case 5:
                calculatedSales = sales * 0.85;
                break;
            case 6:
                calculatedSales = sales;
                break;
            default:
                calculatedSales = 0;
                break;
        }

        // Round to second decimal mark using F2 rounding.
        return (int)Math.Round(calculatedSales, 2);
    }
}