parking-ticket-old.rb

class ParkingTicket
  def initialize(opts)
    @day = opts[:day] || raise(":day is required")
    @vehicle_type = opts[:vehicle_type] || raise(":vehicle_type is required")
    @eet_passed = opts[:eet_passed] || raise(":eet_passed is required")
    ... 
  end

  def base_fee
    1000
  end

  def total_cost
    base_fee + surcharge
  end

  def surcharge
    case @day
    when "Monday", "Tuesday", "Wednesday", "Friday"
      100
    when "Thursday", "Saturday", "Sunday"
      150
    end
  end
  ... 
end