class TollGate
  def initialize(card, balance)
    @status = 0
    @card = card
    @balance = balance
  end

  def read_card
    true if @card == 'toll-card'
    false
  end

  def check_balance
    open_gate if @balance >= 3000
    close_gate
  end

  def open_gate
    @balance -= 3000
    @status = 1
  end

  def close_gate
    @status = 0
  end
end