class Order
  def initialize
    @positions = []
  end
 
  def add(title, price, count)
    @positions << [title, price, count]
  end
 
  def print
    printf("% 20s % 15s % 15s % 15s\n", 'Наименование', 'Количество', 'Цена', 'Итого')
    @positions.each do |position|
      printf("% 20s % 15d % 15.2f % 15.2f\n", position[0], position[2], position[1], position[1]*position[2])
    end
    printf("% 68.2f\n", total)
  end
 
  def total
    subtotal = @positions.reduce(0.0) do |result, position|
                           result += position[1]*position[2]
                         end
    if subtotal >= 200
      subtotal * 0.8
    elsif subtotal >= 100
      subtotal * 0.9
    else
      subtotal
    end
  end
end

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