using System;

public class Program

{

    public static void Main()

         class GFG  

{ 

    static float Calculate_GST(float org_cost,  

                                float N_price) 

    { 

        // return value after calculate GST% 

        return (((N_price - org_cost) * 100)  

                / org_cost); 

    } 

    // Driver code 

    public static void Main ()  

    { 

        float org_cost = 100; 

        float N_price = 120; 

        Console.Write(" GST = " + Calculate_GST 

                        (org_cost, N_price) + "%"); 

    } 

}

    }

 }