❔ Can anyone help me out with a calculation project?

using System;

namespace UppgiftVäxel
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Welcome to the app where we calculate " +
               "the change for one/ several goods when buying and pay for it");

            Console.WriteLine("Enter the paid: ");
            int paid = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Enter the cost money: ");
            float cost = Convert.ToSingle(Console.ReadLine());

            float change = paid - cost;

            int num1000Bills = (int)change / 1000;
            change %= 1000;

            int num500Bills = (int)change / 500;
            change %= 500;

            int num100Bills = (int)change / 100;
            change %= 100;

            int num50Bills = (int)change / 50;
            change %= 50;

            int num20Bills = (int)change / 20;
            change %= 20;
            
        }
    }
}