static void Main(string[] args)
        {
            var workPerson = new WorkPerson {
                Name = "Jesus", Lastname = "Ramirez", Age = 30
            };
            var workedDays = 25;
            var calculator = new SalaryCalculate();

            Console.WriteLine("El sueldo por los " + workedDays + " trabajados es: " + calculator.Calculate(workPerson, workedDays));
            Console.WriteLine("Presione una tecla para salir");
            Console.ReadLine();
        }
        public int Calculate(WorkPerson person, int workedDays)
        {
            var limitAge           = 50;
            var salaryByDayUnder50 = 100;
            var salaryByDayOver50  = 120;
            var salary             = 0;

            if (person == null)
            {
                return(0);
            }

            if (person.Age > limitAge)
            {
                salary = workedDays * salaryByDayOver50;
            }
            if (person.Age <= limitAge)
            {
                salary = workedDays * salaryByDayUnder50;
            }

            return(salary);
        }