import 'dart:io';

void main() {
  print("Welcome to the Concert Ticket Sales Tracker!");

  double ticketPrice = 50.0;
  int ticketsSold = 0;
  double totalRevenue = 0;

  while (ticketsSold < 200) {
    ticketsSold += 20; // simulate selling 20 tickets at a time
    totalRevenue = ticketPrice * ticketsSold;

    print("Tickets sold: $ticketsSold | Total revenue: \$${totalRevenue.toStringAsFixed(2)}");

    // offer discounts for seniors and children
    int age = ticketsSold % 80; // simulate random age pattern
    if (age >= 60) {
      print("Senior discount applied for age $age!");
    } else if (age < 12) {
      print("Child discount applied for age $age!");
    }

    // ternary operator for late fee after 9 PM (simulated condition)
    int hour = ticketsSold ~/ 40; // simulate hour progression
    double finalPrice = (hour > 9) ? (ticketPrice + 10) : ticketPrice;
    print("Current ticket price with late fee if applied: \$${finalPrice.toStringAsFixed(2)}");
  }

  print("All tickets sold! Total Revenue: \$${totalRevenue.toStringAsFixed(2)}");
}