using System;

public class Program

{

    public static void Main()

    {

        int quantity, cash, change;

        int total;

        string choice;

        Console.WriteLine("89 Mansion");

        Console.WriteLine("menu: MilkTea   | Price: P80");

        Console.WriteLine("menu: Slurpy  | Price: P55");

        Console.WriteLine("menu: Shake   | Price: P50");

        Console.WriteLine("menu: Coffee     | Price: P40");

        Console.WriteLine("menu: Tea   | Price: P45.40");

        Console.WriteLine("menu: Halo-Halo    | Price: P36");

        Console.Write("Select menu: ");

        choice = Console.ReadLine();

        if (choice == "fries");

        {

        Console.WriteLine("menu Selected: fries | Price: P10");

        Console.Write("How many?: ");

        //convert Quantity from String to Integer

        quantity = Int32.Parse(Console.ReadLine());

        total = quantity * 10;

        Console.Write("Total: " + total);

        Console.Write("Cash Rendered: ");

        //convert cash from String to Integer

        cash = Int32.Parse(Console.ReadLine()); 

        change = cash - total;

        Console.Write("Change: " + change);

        }

    }

}

​