module CalculationDecorator
  extend ActiveSupport::Concern

  included do
    attr_accessor :calculated_price
    attr_accessor :yearly_offer_number
    attr_accessor :yearly_premium_url
    attr_accessor :position_in_leads
    attr_accessor :quotation_token
    attr_accessor :save_quote_key
    attr_accessor :competitors
  end
end

# and then

calc.include(CalculationDecorator)