# File lib/rhc/output_helpers.rb, line 227
    def format_usage_message(cart)
      cart.usage_rates.map do |rate, plans|
        plans = plans.map(&:capitalize) if plans
        if plans && plans.length > 1
          "This cartridge costs an additional $#{rate} per gear after the first 3 gears on the #{plans[0...-1].join(', ')} and #{plans[-1]} plans."
        elsif plans && plans.length == 1
          "This cartridge costs an additional $#{rate} per gear after the first 3 gears on the #{plans.first} plan."
        else
          "This cartridge costs an additional $#{rate} per gear after the first 3 gears."
        end
      end
    end