Round #791

Calculate the percentage of total sales each product represents.

```csharp using System; using System.Data; class Program { static void Main() { // Create a DataTable DataTable dt = new DataTable(); dt.Columns.Add("Product", typeof(string)); dt.Columns.Add("Sales", typeof(int)); dt.Rows.Add("Product A", 1000); dt.Rows.Add("Product B", 2000); dt.Rows.Add("Product C", 3000); dt.Rows.Add("Product D", 4000); dt.Rows.Add("Product E", 5000); // Calculate the total sales int totalSales = 0; foreach (DataRow row in dt.Rows) { totalSales += Convert.ToInt32(row["Sales"]); } // Calculate the percentage of total sales for each product foreach (DataRow row in dt.Rows) { double percentage = (Convert.ToInt32(row["Sales"]) / (double)totalSales) * 100; Console.WriteLine($"{row["Product"]}: {percentage:F2}%"); } } } ```

```csharp using System; using System.Collections.Generic; using System.Linq; public class ProductSales { public string ProductName { get; set; } public decimal Sales { get; set; } } public class SalesCalculator { public List<ProductSales> CalculateProductSalesPercentages(List<ProductSales> productSales) { var totalSales = productSales.Sum(ps => ps.Sales); var productSalesPercentages = productSales.Select(ps => new { ProductName = ps.ProductName, SalesPercentage = (ps.Sales / totalSales) * 100 }).ToList(); return productSalesPercentages.Select(ps => new ProductSales { ProductName = ps.ProductName, Sales = ps.SalesPercentage }).ToList(); } } class Program { static void Main() { var salesCalculator = new SalesCalculator(); var productSales = new List<ProductSales> { new ProductSales { ProductName = "Product A", Sales = 100 }, new ProductSales { ProductName = "Product B", Sales = 200 }, new ProductSales { ProductName = "Product C", Sales = 300 } }; var productSalesPercentages = salesCalculator.CalculateProductSalesPercentages(productSales); foreach (var productSalesPercentage in productSalesPercentages) { Console.WriteLine($"{productSalesPercentage.ProductName}: {productSalesPercentage.Sales}%"); } } } ```