1. You need to overload the CalculateShippingCost. Therefore the new method needs to have the same name but different parameters. The required parameters are provided in the comments.

        using System;
        public class ShippingCalculator
        {
            // Method to calculate shipping cost for local shipments
            public double CalculateShippingCost(double weight)
            {
                // Local shipments have a fixed rate of $5 per kilogram
                return weight * 5;
            }
        
            // Method to calculate shipping cost for international shipments
            // It has two parameters 'weight' and an additional 'destinationCountry' which is of type 'string'
            public double CalculateShippingCost(double weight, string destinationCountry)
            {
                // International shipments have a base rate of $10 per kilogram
                // Additional $3 per kilogram for shipments to Canada
                // Additional $5 per kilogram for shipments to other countries
                double baseRate = 10;
                double additionalRate = destinationCountry.ToLower() == "canada" ? 3 : 5;
        
                return weight* (baseRate + additionalRate);
            }
        }
        
        class ConsoleApp
        {
            static void Main()
            {
                ShippingCalculator calculator = new ShippingCalculator();
        
                // Test local shipment
                double localCost = calculator.CalculateShippingCost(2);
                Console.WriteLine($"Local Shipment Cost: ${localCost}");
        
                // Test international shipment to Canada
                double internationalToCanadaCost = calculator.CalculateShippingCost(2, "Canada");
                Console.WriteLine($"International Shipment to Canada Cost: ${internationalToCanadaCost}");
        
                // Test international shipment to other countries
                double internationalToOtherCost = calculator.CalculateShippingCost(2, "Germany");
                Console.WriteLine($"International Shipment to Other Country Cost: ${internationalToOtherCost}");
            }
        }