using System;

public class Program

{

    /*

    1. Cost per day

    2. Times how many days

    3. Calculate discount

    4. Calc total minus discount

    5. Add tax

    6. Show the total

    */

    public static void Main()

    {

        var demoCust = new DemoCustomer();      

        var smallAnimal = new Animal("small");

        var costPerDay = smallAnimal.CalculateCostPerDay(); //55.0

        var subTotal = costPerDay * 10; // 550.00

        var discount = demoCust.GetDiscount(); // 20%

        subTotal = subTotal - discount;

        var tax = CalculateTax(subTotal);

        var total = subTotal + tax;         

    }

    public static double CalculateTax(double subTotal) {

        // calculate up the tax on subTotal

        return subTotal * 0.0825;

    }

}

​

public class Animal {

    public string AnimalType;

    public Animal(string animalType) {

        AnimalType = animalType;

    }

    public double CalculateCostPerDay() {

        if (AnimalType == "small") {

            return 55.0;

        } else if (AnimalType == "large") {

            return 65.0;    

        } else {

            return 45.0;    

        }                               

    }

}

​

public abstract class Customer { 

    public string Name = "Jason";

    public abstract double GetDiscount();

}

​

public class DemoCustomer : Customer {

    public override double GetDiscount() {

        return 0.20;    

    }

}